Hi there, I was diagnosed with slow transit constipation through Sitz Marker test. My symptoms were persistent constipatuon that got worse over time, bloating, early satiety, occasional nausea. I didn’t have much pain really except if badly constipated I’d get rectal pressure/pain. A gastric emptying scan is what’s typically done to accurately diagnose gastroparesis. I know with slow motility I’ve been advised to limit fiber intake. No Metamucil, Benefiber, etc. I used a combo of OTC lax like Senna+ , Bisacodyl, & if needed, liquid magnesium citrate. I tried increased hydration, increased exercise, chiropractor, multiple prescription meds including Linzess, Amitiza, & Motegrity. They had varying degrees of effectiveness, some, mainly Motegrity, for me had awful side effects that wouldn’t go away and was as bad as what I was trying to treat. It was unfortunate because that med was fairly effective but I couldn’t function. Last January after struggling for several years I had a loop ileostomy done keeping my colon intact. It’s been very helpful. It doesn’t resolve dysmotility but helps manage it considerably. Usually STC can be managed without surgery. I think my situation was more extreme and I have post viral Dysautonomia so that contributes to nerve dysfunction in my stomach my GI doc told me. I would caution using extra fiber until you know more and if you’re still having trouble ask your doctor about a Sitz Marker test. Also try to consult with a second doctor if possible. The biggest lesson I learned with GI health is how important it is to get more than one doctors insight, if possible from separate health care organizations.