First, get checked as to the cause of the rash. Panic attacks do not give aching joints. My doctor, as well as other doctors, except one who thought it may have been electrolyte imbalance, all said it was a panic attack. By the way, I still had to take 900 mg Lithium. I would be most appreciative of an answer as it was the scariest experience in my life, and I have had panic attacks before.
Heart attacks are cessation of blood to a part of the heart.
Not to be confused with tachycardia when the heart works fine-just beating too fast to be effective. Both can be fatal, but are significantly different. Lastly, your physician probably restarted the dosage too high which caused the problem. Usually, we start at a lower dose and work up to avoid exactly this problem. I want information on possible side effects or what to watch for that could be a concern or contraindication for this medication.