Immune system

I think the docs have really screwed up my immune system. I popped a reaction last night.  Severe itching all over.  I took an antihistimine and the itching went away along with the huge welts.  And I'm not sure they haven't done some damage to my heart.  I am going to see a cardiologist as soon as my doc sends my records to him.  The skin on my arms looks like a burn victim.  Not as bad, but it does not have the texture of normal skin and I can't get in the sun without sunscreen.