Unprotected sex , anal and vaginal

about 5 months ago i was in a relationship with a lady and we practiced unprotected sex, both anal and vaginal. i have constant itches on my body(not all the time) with my arms, head,stomach, legs and shoulders being afected most.
Now it has developed to an on and off rash which last about 15 mins or less and disappear. I have done all sorts of allergy test and its all negetive.the rash dont come up if i dont scratch my body really hard and it becomes reddish. coupled with that i have a blurred vision now and then and loose stools from time to time. Is this all due to stress or should i be worried i have contracted the hiv virus? Am i too worried over nothing or is there a real cause to worry about? i havent loose weight, i dont have fever, nor diarhae just loose stool from time to time.
Please help me as iam really really stressed up and could feel the tingling of the veins at the back of my head.
Thanks in advance