Question: Five weeks ago I had developed quarter size red itchy blotches on my skin. Four weeks ago I began getting head aches which started becoming severe head aches. When the head aches started becoming severe it started causing nausea and vomiting. One day when my head ache was most severe I believe I blacked out for a short time and vomited I went to the ER and they ruled out aneurism. Now I'm dealing with hives and itching over my entire body. My question is, could it be that all of this is due to an overreaction by my immune system pumping out too much histamine since this is the first time I have had an allergic reaction? And since I have been taking anti histamines I haven't been getting sever head aches. I still have hives but recently up the dosage of Benadryl and am taking steroids.
I want to know if all of my symptoms are due to an immune system response from the allergic reaction (not what my allergic reaction is) and if the allergic reactions go hand in hand.