Pleaseee urgent question need good help !?

Hey everyone Im really worried about HIV I keep getting anxiety attacks and worrying so much its ruining my life I tried anal with a guy I wanted to find out if im straight or gay I didnt get hard so then I realized I was straight it didnt feel good but anyways important thing is I did it for like not long 30 secs to 1 min he told me he doesnt have HIV I dont trust him but hes like NO WAY and stuff I havent really gotten many effects like I actually been gaining weight (Muscle infarct) since I workout but like I got sick after it and for a while I was geting sick on and off but the weather was bad though I go to school to so :P but im really worried anyone know anyway to stop beeing so worried cuz I wanna forget about it PLEASE! thank u thank u thank u whoever answeres I need a quick on ill give 5 stars