Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

I've always had anxiety, without realising. I also self medicated with smoking. And when I quit smoking, oh boy. Lots of panic attacks. Lots. the withdrawals feel exactly the same as a good quality panic attack. :D You sort of can't tell the difference.
Took a while to realise that this was happening. When I did, that helped because I knew I just had to outlast these experiences, and not necessarily take them seriously. If I could outlast the withdrawals and the addiction, then these panic attacks would leave.
I got sleeping pills for the insomnia (and I got restless leg). That helped a lot. Also vitamins, a good daily multivitamin did make a big difference to the anxiety.
What I learned from all of it was that your body can have huge chemical reactions and your brain will play along. Your mind believes the chemicals the body is sending. So it can tell you have fear, and it hunts for something to be afraid of.
When you are not in this state of anxiety, your brain doesn't think this stuff up. It's only hunting for an explanation for the huge chemical burden of adrenaline and cortisone hurtling around it. It's finding you a bad guy.
Even when there isn't one.
It's fascinating. If you treat yourself like your own test subject, it's fascinating what you can catch yourself doing. We really are biochemical organisms. We are clusters of electrically charged chemicals, dribbling about. Not a single piece of us is alive, but all of us together, as a community of cells, is alive - and our brains are just one small bit of that, and a bit that isn't always perceiving clearly, or particularly helpful, at that.
I have ever since then wondered how much of my anxiety was cured by smoking, and how much was caused by smoking. Did smoking create anxiety withdrawals? Or did anxiety create smoking relaxation? At some point the two of them entwined and became a self-fulfilling prophecy. At some point smoking stopped helping me cope, and started being the thing I had to cope with.
Anyway stick it out. I found when I hit my 1 year anniversary of not smoking, I had this gut feel of having made it to a milestone. I haven't had a cigarette since May 2010, can't remember the date, and I can't see any reason or any environment which could ever convince me to try it again. I'm absolutely 100% happier and less stressed without them.
Not perfect, but way better. :D