wow i feel anxious just thinking about smoking or snorting drugs. Truth is, drugs or no drugs, these are perfect symptoms of anxiety/panic disorder or GAD. Its fair to say that you (soup6), like i feel uncomfortable ALL day almost EVERY day, true? Theres always somthing. and when you do come across a day(like today for me) when you feel really good, and then you realise that you feel really good, your start thinking why do i feel really good, hmm i wonder what i did to forget and relax for a bit, oh how i hate feeling like i cant breath, or that my heart is constantly racing and then POW you start feeling your heart belting out in your chest, you feel tight and breathless, maybe light headed also. Our minds play some crazy games with us, they say that if you think about something so much, then eventually it becomes you. thats why any therapist will tell you that you need to find a distraction. I find if im lying about and have nothing to do or think of thats when im at my worst, my brain starts menafesting on what my body is doing. try this, one a calm day, imagine you have pain somewhere, think about it constantly, and you will see the power of the mind, eventally you will get pain in that area because you've been thinking about it so much.
the trick is distraction, when i feel my anxiety getting hold ill literally tell myself to get up and distract myself, or go look at urself in the mirror and tell urself to pull it together, its your brain, get a hold. whilst most times this doesnt work its a good habbit to get into, you start training yourself to take immediate action over yourself.
I know its hard, but there are ALOT of people in your boat.