some good advice here imo.

I've had some anxiety/depression issues before and am pleased to say i've come out the other side of them feeling a happier, stronger and healthier person.

get down the doctors and answer his/her questions as honestly as possible.
stop the weed - it won't help.
stop the boozing - that definitely won't help.

Unless your replies to the questions indicate that you are very seriously depressed, the doc will probably tell you to stop the smoking and drinking, get some excercise and try to do at least one thing a week that makes you happy.... e.g. catch up with old friends etc. then come back in 6 weeks or so.

If you're still feeling that bad after the 6 weeks (or whatever period is recommended) then you may find that you're prescribed something - in my case they were primarily to help me sleep but also a mild anti-depressant - and referred for some counselling.

I have to agree with bigchez on this one... i tried more traditional style counselling where you just talk about stuff but didn't find it to be much help. However, I went to see a guy in Harley st (thank fuck for medical insurance!) for CBT and it was superb. It really shows you the errors in your thinking and helps you approach what previously may have seemed to be an insurmountable problem in a logical and positive manner. I must admit, the effectiveness of CBT really surprised me and it has made a huge huge difference to my everyday life.

I guess it's differernt for everyone, but as has already been said, realising/admitting you have a problem is a major step in the right direction... so don't hang about - act on it and get down the docs asap. The sooner you do the sooner things should start improving for you!