I would not take another prescription drug like gabapenten to replace cannabis... I am wondering if you’re feeling all the anxiety, depression, anger etc that youve been suppressing with cannabis. You could definitely be feeling a lot of things that you don’t know how to deal with. My personal beliefs are that cannabis is the safest thing out there to treat a lot of issues from mental health issues to physical stuff, but if that isn’t the route you want to take I would highly recommend therapy to help you process and learn new coping skills if you aren’t already in therapy..