Please help me

Hi so I'm 16 years old and I'm sick, I have constant diharrea and I sometimes poop about 7-10 times a day and my doctor has been trying to figure this out for a year with blood tests, stool tests and urine samples but they never get anything out of it so she sent me to a specialist a couple weeks ago and she told me to try the fodmap diets and it didn't help at all. I just started going to culinary school but I'm too sick to leave home :( last week I passed out and was out for about 3 minutes so I went to the Er and the did some monitoring of my heart and pulse but found nothing wrong (I sometimes get severe pain in my chest) they said I passed out because of fluid loss since I have not been able to keep anything in and if I do I shit it out in an hour so I am giving up, nothing is helping and I'm just done. I'm done I've been like this forever and the pain and the pooping is killing me please if you have any advice or anything at all please comment I am desperate for help