Depending on the symptoms and the person, you may wish to call your primary care physician or 911. Pay close attention to symptoms.  Prolonged heatstroke damages the brain, causing anxiety, confusion, seizures, headache, dizziness, lightheadedness, hallucinations, coordination problems, unconsciousness, and restlessness.  Sunstroke can also affect the heart, kidneys, and muscles. It’s better to be safe than sorry. Call emergency services if you observe any of the following symptoms:  Signs of shock (ex. bluish lips and fingernails, confusion) Loss of consciousness A temperature over 102F (38.9C) Rapid breathing and/or pulse Weak heartbeat, lethargy, nausea, vomiting, and dark urine In some cases, they may be collapsed, agitated or even in cardiac arrest, so take care and start CPR if necessary Seizures. If the person is having seizures, clear the area for the patient’s safety. If you can, place a pillow under his head so it does not bang on the ground during the convulsions.  If milder symptoms persist for an extended time (longer than an hour), make the call. Our first instinct is to take medicine when we don't feel good. If someone is suffering from sunstroke, certain medications will only make the situation worse. Don’t use medications for fever like aspirin or acetaminophen. These can be harmful during a heatstroke because they may increase bleeding, which can be a very serious issue with blistered sunburns. Medications for a fever work well on someone with an infection, not on someone with heatstroke. Don’t give the person anything by mouth if he is vomiting or unconscious. Anything that enters the person’s mouth could become a choking hazard. While you wait for emergency services, get the person to a shady, cool (preferably air-conditioned) area. Remove all clothing and get the person into a cool bath, shower, stream, or pond if possible. Avoid very cold temperatures. The same goes for using ice, which may also mask the signs of a slow heartbeat and cardiac arrest. Do not do this if the person is...

===
Write a summary of the previous text in Vietnamese:
Gọi cấp cứu. Tránh dùng thuốc. Làm mát cơ thể người bệnh. Bổ sung nước và chất điện giải. Giữ người bệnh bình tĩnh. Để người bệnh nằm xuống.