First off about
the plasma donation
. I worked at the blood bank over the summer and I would watch over the people after the donated blood/platelets/plasma. You'd be surprised at how many people have funny reactions to it. People are passing out
, having trouble breathing, sweating, getting dizzy, and just overall not feeling well. Personally, I don't think you donating
plasma has anything to do with your continuing problems.
Secondly, seeing a gastroenterologist is a good idea.