Hiv fears versus anxiety? urgently need help!?

Well I know exactly what you are going through because I once thought I had HIV and i was CONVINCED i had it but i got tested and I was negative. I also have severe anxiety. My question for you is, how in the hell do you handle ecstacy and/or any other drugs for that matter if you have such bad anxiety?? I have had people take me to the ER just from panicking so bad being high on mary jane