What can I buy for parasites in stool and also I have them in my bladder, I have infection often , and also uncrontrolled bowels, I can see the bugs in stool, sometimes stool is blac tarry, and sometimes diarrhea yellow with yellowish bugs the size of large head lice. I am a retired teacher, so I am sure from experience that this is parasites... doctor has not done stool test, but I want to find something to cure this...it has been going on for about 2 years, and dr. not concerned...have also problems on arms and shoulders... what can I buy to cure this?