Bowel movements troubles bloodish

Hi to all, before all I want to inform you I suffer from anxiety disorder (and small depression) and I am on medication for this (bupropion). Recently 2 weeks ago, and exactly after the end of summer vacations I started having changes in bowel movements , more often to toilet with looser stools , and lower abdominal pain. My psyc said it might be the start of IBS syndrome and put me on amitriptyline. What worries me most is that yesterday after a bm I noticed lots of red small pieces on stool(almost diarrhea),, it must have been tomatoes skins when I scanned ,,,but what's scary when whipped with toilet paper there was a tinny red (like pinhead and red like runny nose), that when squised soft into paper it painted it red!! I think only blood can do this! it's soluble in water. Can food (tomatoe) paint-like the paper.

I ll get an appointment with gastroenterologist for sure .

Fyi, recently I was almost 20 days on antibiotics for rebounding strep throat. Symptoms occurred almost a week later. last night as well I had a bad diarrhea which seemed black to me but it was not on the toilet paper(illusion maybe from the amount of diarrhea in toilet).Anyone relevant experience ??thank you

Tomato skins can be hard to digest, however if you are in any doubt talk to your GP

bob