Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: 37F, 5'7, 128lbs, Caucasian. Primary complaint is increased resting heart rate, palpitations at night that wake me as I'm trying to fall asleep and fatigue.Symptoms started 06/15/2022 with one severe episode of diarrhea. After that I was feeling very fatigued. On 06/22/2022 I was very dizzy and almost fainted, my heart rate was elevated (120-140) and I had tingling/numbness in my hands and feet. Went to the ED. Only thing they found was a Potassium of 2.6, they said my ECG was "inline with my low Potassium". They gave me IV Potassium, Magnesium and saline. Got my Potassium up to 3.8 and sent me home.Three days later I had a similar episode and went back to the ER (I thought maybe my Potassium was low again or that maybe it was my heart). They did another ECG and said my heart was fine. Potassium was fine. No other abnormalities. ER doc said maybe viral or Thyroid.In the weeks after my ER visit I was still feeling very weak and my heart rate was still elevated (80's laying, 90's sitting, 110 standing). I was still dizzy. My stomach was destroyed, I couldn't eat without getting severe reflux and I just wasn't hungry. I thought it could be POTS. My symptoms were worse in the morning and in the evenings I felt almost normal.Symptoms slowly started to improve as I started breathing/meditation exercises and started getting back into training and eating. (I lost almost 10 pounds during this because I just couldn't eat).I then started to experience adrenaline surges where my heart would race, I would feel very jittery, nauseous and I would have to pee many times. At first the surges happened only in the morning, but later started happening at night. Only one a day. The surges would leave me very tired. I had very poor exercise tolerance.I saw my PCP and we ran many tests, CBC, BMP, Full Thyroid Panel, T3 and antibodies, H.Pylori, AM cortisol, Catecholamines, PTH, Heavy metals, MTHFR, DHEA serum, ACTH plasma, celiac panel, Homocysteine, CRP, 25 hour Urine Catecholamines and Metanephrines, Folate RBC and serum and B12. The only "abnormal" tests are below:Alkaline Phosphatase low 32 (this has always been low for me).High epinephrine 67 (I was having a "surge" that morning, I am not afraid of blood draws).Heterozygous C665C MTHFRHigh am Cortisol 21.2 (I was having a "surge" that morning, I am not afraid of blood draws).DHEA 686 (she said it was normal but it seems high for me based on my age).24 hour urine Normetanephrine 122 lowFolate RBC 1248 (for context)Folate serum >20 (for context)B12 852 (for context)Background information: When this all started, my husband and I were trying to conceive and I had been taking 800mcg of Methylfolate to prevent neural tube defects since May. The day I ended up in the ER was the day I got my period. I thought that maybe, based on my MTHFR mutation, I had a bad reaction/poor tolerance to the Methylfolate so I stopped taking it 2 weeks ago. My symptoms seemed to align with too much Methylfolate, based on other peoples reports.My biggest complaint now is the palpitations at night. I keep getting jolted awake several times as I am falling asleep. This lasts an hour until I fall asleep until morning. Palpitations are felt when I am lying on my side and sometimes when I lie flat on my back. I have headaches off and on and still feel like something isn't right, like my body cannot relax. I also get this feeling of pressure in my head. I don't have any shortness of breath except for when I am jolted awake at night.I am not an anxious person thought I am certain these issues have caused worries. I am active (strength training three times a week, assault bike workouts and lots of walking/hiking/paddleboarding). I do Olympic lifting for fun but haven't gotten back to that yet. I eat paleo-ish, low carb, Weston A. Price though I am trying to incorporate more carbs into my diet. I take Magnesium Glycinate at night, probiotics, Vitamin D and Cod Liver Oil. I practice good sleep hygiene. I don't lead a stressful life. I have a cardiology appointment at the end of August.Any input would be greatly appreciated as I have already spent so much money on all this, I need to be efficient with my resources.Im thinking that something really messed me up, maybe the Methylfolate combined with a stomach bug? I had COVID in January, maybe that has something to do with it. Will this likely resolve on its own?Thanks in advance!. ### Response: I dont think methyl folate has anything to do with your symptoms. My hypothesis is that the first occurrence sensitised you and made you more introspective. Fear of something can cause tachycardia and introspection can make you notice your heart beat, where you previously wouldnt have noticed it.Relaxation exercises, especially breathing exercises and a distraction from your own thoughts via audio book or podcast might be helpful. 24h ECG could objectify your symptoms, but Im not sure thats a good idea. Maybe try it for a week or so and get back to me, if it doesnt help? Cant promise Ill immediately respond, but I check up on Reddit regularly :).