Suffering from depression (although it has got better), I've been suffering from major anxiety, and terrible acid reflux.
Scott
There is no doubt that nicotine is a drug that effects the body, especially the brain. You become addicted to it, and then whenever you are feeling down or anxious, you suck on that dip desperately until you feel better. Hell, if the anxiety is bad enough you double the amount of dip you do in a day, and constrict your lip around your teeth to speed the release of nicotine from the dip. I guarantee you know what I mean.
So all of these years you have been using nicotine whenever you feel down or anxious, and now you need to develop another method to cope with this depression and anxiety. Don't just sit there an wait for it to go away, start doing something healthy about it: exercise regularly, eat better, stay away from alcohol when you are feeling this way, talk to others about your problems in order to problem solve, start putting together goals so that you can overlook the bad stuff because you are an a path towards something worthwhile.
If the acid reflux is out of control, go see a doctor about it to get some relief.
I don't want you sitting there suffering second guessing your quit because things have gotten worse for you in some ways since you stopped. Don't take a passive quit, take an active quit, and start addressing these other problems in your life with solutions. Nicotine, amigo, is not one of the solutions.