Black pieces in stool

So I won’t beat around the bush I will be straight up and honest I have done a fair amount of hardcore drugs from weed,ketamine on the occasion,ecstasy on the occasion and I was a casual cocaine user (1 time every week or every few days for about two months). I recently took ketamine on newyear and I was fine all New Year’s Day . I then ate 3 high fatty bacon rolls the day after as I got high with my brother . Later that night I noticed my heart beating hard in my chest and it looked like it was beating in my stomach . I googled everything looking for some sort of quick answer to the problem and to try and sort it out . Anyersums,heart attack on the horizon, you name it , they all came up . I went into a.e that week and described my symptoms which was Chest pain and abdominal pain , had an ECG done it all came back normal to my relief but I still had Chest pain which they presumed was extreme anxiety . This story will go on forever, like I said I’m just getting started . So I booked an appointment with my g.p and he prescribed omeprazole for the stomach and half beta progane for the heart . My chest pain has stopped , that no longer exists . However my stomach pain i lived with every single day for a month from the time I woke up to the time I went to bed I had a dull ache in my stomach . I constantly went to my doctor and he constantly said it’s a viscous circle of anxiety . This is not anxiety. It has now been two months this has been going on , I have been working so hard to get healthy again , I haven’t drunk alcohol, taken any drugs , smoked weed . I have exercised at 6am every day for the past two months , went for 30minute runs every day, ate healthy food(by that I don’t just mean fruit and veg , I have done my research , I have cut out gluten  for 2 weeks now ,ate salmon as that is high in omega 3 and good for your heart , drunk bone broth as this heals your stomach lining, freshly squeezed lemon juice and warm water as this heals your pancreas , liver and gallbladder , apple cider vinegar as this aids digestion . I have started taking collagen, digestive enzymes . Drinking water every 2 hours  ,A 500ml bottle . All of that , is just of the top of my head what I have done to try and sort this out .

This is where I am at now . I no longer have a stomach pain but my stomach is constantly making noise , which i can only presume is my bowels , I have insanely realistic dreams every single night which I can recall off , they are out of the ordinary, my memory has depreciated massively over the last week , I struggle to remember what I have done in the last two days but it’s kind of like I am conscious of my doings just can’t remember , it’s almost as if the dreams I have wipe my memory . I was waking up with a sore head for a week but since I cut out the gluten that has stopped happening , my stool was yellow in colour but after the gluten was cut out , that changed aswell . But I have noticed their is yellow corn like pieces in my stool most of the time and last night I had almost like a big black bean in my stool which I can only presume is blood ...

I understand this is a lot to take in , if anyone has any questions about my story I will reply to every one as I will be checking this post every hour .

If someone can guide me on what else to try out I am genuinely willing to offer some money to someone who can aid me along . 

Also some other facts about myself - I am 19 years old and besides my drug phase during summer I am very active and exercise a lot . 

(I drunk probiotics last night and felt perfectly normal until I woke up this morning I felt normal also then I had something to eat and started feeling the same as before