Quitting and stomach issues

Hy Guys!

Im quitted nicotine pouch (cold mint killa) 8 days ago. My stomach doesnt felt normal so i decided to put down nicotine and see what will happen. I little depressed because im feeling that pain never go away. Im 8 dayz nicotine free and i dont feel any improvements. What do you think guys? How many days should i waiting before going to the doc? (Last year i had all the possible exams and everything was ok inside)

Edit: So i wake up on day 9 to a panic attack. I have 0 interest to hit nicotine again