I'm happy to read this thread. I'm honestly not sure where I am in this process, lol, the first few days I smoked 4 a day, then quickly got down to 2 a day for a couple of weeks and tried 1 a day but only for 2 days. Now I have been smoke free for almost 13 days and experiencing many of these symptoms. I really am not accomplishing anything at all, just sitting at the computer, no energy, and no desire to create, I'm a digital artist and crafter. I have a mild headache at times and an almost sore throat that comes and goes and just generally feeling blah. I have suffered with panic disorder for at least 30 years and that doesn't seem to be acting up at the moment, but since I came to terms with it, that seems to be the way it goes, no panic attacks for sometimes months and then boom there it is again.
The last few days I've really wanted a cig, and it doesn't help that my SO is still smoking so they are here and nothing I can do about that.
I've had stomach troubles off and on for much of my adult life and sometimes now it's better than it was and sometimes different altogether.
I'm really happy to see that this is all to be expected and will pass soon.