Jay, depression is a tricky beast at the best of times. Throw alcoholism into the mix and you've got yourself a carnival ride my friend. It may be too early to talk about Post Acute Withdrawal Syndrome, but then again, I'm no physician or clinician. There's an excellent link around here somewhere about PAWS, and if someone could direct Jay to it, it may be helpful. I just can't bleedin' find it right now!
For me Jay, feelings of depression and sadness are part and parcel of leaving behind a behavior that had become very dear to me, in a sick way. Once the alcohol and other substances had left my body, I was faced with the task of dealing with things I had long repressed with the help of a bottle or a bag of dope. I'm glad you're seeing your physician tomorrow. Ignoring this right now would be a sure way to talk yourself into relapse. I know, I've done it.
Keep posting.