I quit aug 2019 and still have all the symptoms you describe. I also get these bad tension headaches which I never had before. The bloating is the worse. Acid reflux medicine didn't work for me so I take mastic gum which makes this better but I also incorporate lots of fruits.
I have been checked out by different specialists and and gone to the emergency rooms several times. I also got a stress tests, mri, and ct scans. Everything has come back normal. I quit cold turkey thinking the symptoms were never gonna be that bad since I was only smoking a few cigs towards the time I quit too. I was never a heavy smoker also.
I started working with a therapist and hopefully that helps going forward. Please keep me updated on your progress.