Possible yeast allergy?

Is there such a thing as a yeast allergy? I have noticed that I can't eat very much pizza or drink much beer without getting an upset stomach and sometimes vomiting. I have a whole list of symptoms that may or may not be related to this issue. Severe constipation, weakness, tiredness, painful sex, miscarriages, pain on both left and right sides below belly button (possible ovaries, and mainly my left side), migraines, stiffness in joints (mainly fingers), aching joints, weak immune system. I know many of these symptoms are caused by the severe constipation. And by not eating breads or drinking beer, my symptoms are mostly gone, but not totally. I have been to many doctors over the past 12 years, had many tests done, every one says I'm fine and healthy, or they are trying to give me pain meds that I'm not interested in. I have spent $10,000+ and am tired of not getting results. So I am trying to diagnosis this on my own first. Any help is greatly appreciated! Thanks!