IMO, don"t take collagen, especially collagen peptides which is really too pure (like sugar is to carbs). With it,some people have gone worst to the point of ending it. Those things like collagen peptides, BHB peptides, butyrate salts, they don’t exists in nature. They’re too concentrated.
You seem in pretty bad shape and in my opinion, you would need an all natural diet before even taking bone broth or gelatin (both are milder forms of collagen)
However, if you can manage to become ketogenic, it’s really very good for the joints, the digestion and the brain. I know, I know. I keep repeating myself but it got me rid of most of my symptoms.