When Does the Constipation get better?

I got my first 300 mg shot 3 weeks ago. When I was on suboxone I never had any stomach issues, but since getting this shot the constipation has been horrible. I know I need to increase my water intake, but I have tried: prune juice, laxatives, fiber gummies, eating more veggies, etc…. Nothing seems to work . Someone suggested some Magnesium product (that’s coming tomorrow)

I don’t think I will be getting any more shots because aside from the constipation I feel very depressed. I’m not sure if this has to do with the shot, but I’m not interested in anything that I used to enjoy. I’m getting ready for the gym right not because I have read that exercise is important, but I just feel like a robot going through the motions.

If anyone could give me an estimate of when constipation gets better, I would appreciate it, thanks!!!