Hardly any appetite, no good bowel movements for a while and skin blemishes?

Hello, I've been having trouble with bowel movements for a while now, and I've suddenly developed skin blemishes and slight hair loss. I've already been to three doctors and haven't received any answers yet. Stool samples were good, and the colonoscopy results were also good. My next appointment is a gastroscopy, but not until January next year. I don't want to wait that long, and if I'm not mistaken, I had some blood in my stool yesterday (none today). I'm in almost no pain. Occasionally, I get brief, mild abdominal pain, but it's really rare, and it goes away after a bowel movement. I'll go back to my family doctor on Monday and put some pressure on myself. Before I do, I wanted to ask here if anyone has experience with this or can give me some tips. By the way, in case it matters, I'm 24 years old, have always exercised regularly, and eat quite healthily. (I drink 90% of my daily diet only water and eat mostly organic products.)

Thank you very much in advance. 🙂