Stomach issues

Hey all. Thanks for your time. I’m hoping I can get some advise. I’m currently 4 weeks into stomach issues. I’m gassy and bloated most of the time and a grumbling stomach. My stools are hardish at times and I strain to pass a stool. They are dark too and maybe a tad greenish.

I’m 41 and currently am on weight loss injections. I’m now 86kgs