I wouldn’t be keen on taking drugs that have been prescribed through guess work either. When I first started on insulin I ended up in so much agony with my digestion, a gastroenterologist said they are related but the endo said no it’s not. Unlike you I’m not definitely type 1 tho. Sure enough every time I use insulin I get the same thing, I’ve been using it in and off for the last year which obviously you can’t do and isn’t advisable. My DN did say that not all insulin’s agree with everybody, maybe that’s something you could look into? Just with you saying your diet is the same but it started after diagnosis. Or maybe you have felt particularly stress/anxious since your diagnosis? This can cause havoc with digestion especially if your anxious with the actual act of eating. Do you have many lows ? This can also trigger stomach acid over production I believe. Just chucking some thoughts out there. I’m having microbiome testing done at the minute, this can help see if your stomach bacteria is out of whack as that can be corrected