TW: Talk of blood TMI

Ok so I’ve had rectal/anal bleeding quite a few times now. I think I start my period but the it’s not. I’d say it’s mild-severe bleeding. Sometimes I’ll have clots as big as a quarter and other times I’ll just have little ones. It’s usually bright red- slightly dark red (but still kinda bright) blood. I’ve struggled with stomach issues all my life and have no idea what it is. I can’t have lactose or gluten (although I still do sometimes). I went to a specialist and got and upper go and they said they found food still in my stomach and gave me medicine saying it digest slowly but then when I went back to see how everything was (months later) she said she never said that and I was lying about not eating past 11 (then who has been giving my meds 🙄). I have a whole bunch of other stuff (medical) going on and it’s hard to have time for drs find them and get appointments (especially with covid now). So I haven’t gone to a different gastroenterologist yet. I’ve gone to a dr for the bleeding and had a rectal exam nothing was wrong and he said it’s because I didn’t have enough fiber and prescribed me some (he also said not to eat raw veggies or salads because it’s hard to digest but when I came back later for a check up and it was still happening he said it’s because I’m eating lots of pizza and laying down when eating and drinking sodas a lot he also said he never told me not to eat salads ( calling me and my mom a lier), I never go to dr appointments without my mom (I’m 20) because of anxiety from then never listening because of my age and so I have other ears to hear what they say for situations like this or if I miss something, I also drink a lot of water because I get dehydrated easily, I don’t drink a lot of soda, I’m not a big junk food eater and love my fruits and veggies, and I hate pizza. My parents also drilled it into my head growing up that you don’t lay down while eating because it’s bad for you so I never do. He would just talk over my mom and me. repeating the same thing about me eating pizza and pretty much calling both of use liers when trying to tell him I don’t eat like that. He would raise his voice whenever we tried speaking so that he was talking over us and then gave me a calendar to write down when I poop and when there is blood and walked out (we never went back). But I have no idea what could be causing this and idk what to do. I’m so sick of drs dismissing me and calling me a lier. Has anyone else experienced this? Any tips on what to say or who to go to to help figure why this is happening? It’s so frustrating. I’ve been having bleeding off and on for years. Any help would be much appreciated.

I also want to add it’s not based off what I eat. It doesn’t happen every time I have gluten. I can’t find any connection on why it’s happening or what could be causing it.