Nausea, chills, migraine, chest pain.

Sir/Ma'am, I'm having severe migraines on most days. I also have very low energy levels. My resting heart rate is between 65-75 on an average. I'm having severe chills today, accompanied by tightness and discomfort in my chest. I have to wear a sweatshirt to stop feeling cold, but I'm swearing as well. I don't have any fever. I'm having a lot of nausea as well. My water intake is between 3-4 litres in a day. There's an odd sensation in my ears. I'm on anxiety and depression medication, namely Sertraline 50mg and Atavin 1mg. I've recently started excercise of 1-2 hours daily, and have been having migraines since before that. My stools are normal, but have been more smelly than usual. My urine is also normal, and clear in color. I have a history of anxiety attacks but I do not think this is an anxiety attack, as I have not witnessed these symptoms before and am feeling neutral mood-wise. I would appreciate some input on what might be wrong. Thanks, Ananya