system
A chat on 4chan
human
there are a number of causes of bad kundalini experiences:
(1) imabalanced practice: you must keep the 4 elements and 7 chakras in balance in your practice. Gopi Krishna had a horribly imbalanced practice of meditating on his 3rd eye for 3 hours a day, avoiding his other chakras. No wonder he experienced disorientating effects. When you have imbalanced energy you need to back off your practice and attain balance again. 
(2) Poor health: If you are unhealthy this can make it harder to achieve good results in energy work. Fix your health, and oftentimes you can handle higher levels of practice. If you have chronic anxiety when you start practicing kundalini yoga, the fire chi you cultivate can sometimes exacerbate that anxiety, but if you fix your health to eliminate the anxiety, you will be good to continue practicing. 
(3) Drug Use: Drugs do not mix at all with energy cultivation and kundalini. Drugs cause your nervous system to release energy and chi, which is what gives you pleasurable feelings. But energy cultivation is the opposite of this, where you are trying to store up chi in your nervous system. Mixing these two opposite things brings bad results. Taking psychedelics while you have cultivated lots of chi can damage your energy body, and you might have to take a few years off until the damage heals before you can practice again. Increasing the fire chi will increase your confidence and sex drive a lot, and when this is combined with stimulants, including coffee, this can really throw your ego out of whack and make you a bit schizo. Schizophrenia is related to too much dopamine being released for insignificant things. Equanimity has always been the true path of meditation, and this means no drugs. 
(4) Pushing too Hard: Sometimes you have to be patient. If you cultivate more chi than your nerves can handle, you will have schizo-like experiences, and this is a sign to back off your practice until your nerves and consciousness can handle it.
gpt
Do you have any recommendations on balancing the fire chi/Solar plexus? I’ve been trying to resort to alternative methods because traditional medications haven’t really been working for mental stress and repressed anger. It’s been getting to the points that I have sternum pain and heart palpitations even though I’m in my 20s, despite exercising every other day and being healthy weight. Several people from who practice energy medicine, all from different circles, told me that my solar plexus, or “fire element” is so massive that it’s overpowering the other elements, especially the one in my heart or “air” element. They said the air is trying hard to release itself in the heart, but it’s getting the shit kicked out of it by the fire in my stomach. They recommended that I eat more green veggies and that’s actually sort of been working. What else should I do to keep that in check?
human
Therapy, get to the root cause of the anger. Or an anger management course, which is not so much therapy as understanding the feelings which give rise to anger and changing how your mind and body reacts to them. I did a one to one course with a psychologist and it was really worthwhile.

Or Richard Grannon's Fortress Mental Health system on YouTube is an easy way to get into understanding more about yourself.