Unfortunately, a lot of your questions are difficult to answer and probably somewhat subjective depending on who you ask.
For (a) If you really want to know where things stand, you would need a scope. There is also a stool test called calprotectin, not as accurate as scope, but can indicate inflammation in stool, and the results coincide with inflammation in your colon. It is possible that you're being nervous in seeing it is "slimy". It's really hard to tell since the symptoms are so vague and mild. As people with a bowel illness, we are generally worried and quick to think something is wrong.
Were you diagnosed with a colonoscopy and biopsies? Procitits is not Ulcerative Colitis or Ulcerative Proctitis. Have you had stool tests? Have you tried antibiotics? Proctitis isn't necessarily chronic. There is a good chance that it may not progress to UP/UC. Mine did, but they say it's relatively low odds. If you have proctitis, any ulcerative colitis information, will likely be quite inaccurate.
I think you should make a follow up appointment and ask your questions, but also go over that pathology report, and see what it says. Ask if they've ruled out bacterial/pathogenic causes...
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