your right,parasites can effect the immune system,and have been to trigger an immune response,antibodies,and cause a false positive.you,however had a negative result past the conclusive hiv window period of 3months,your fine.
The chance of acquiring an intestinal parasite in a developed nation is extremely improbable. It didn't affect your test. Negative is negative!
alright, thank you guys. bless you all. I'm going to keep my head up and hopefully I'll be better in a month. :)