Doctors and specialists can not find out whats wrong with me!!!!?

i am a 24 year old male who has been sick for about 6 years.i feel like the problem lies in my stomach/gut area but i have seen so many doctors and they can not tell me why i am suffering. my stomach/gut is almost constantly upset. about six years ago it started with me getting really sick. i started getting nausea and just started vomiting constantly. i was not able to drink or eat anything for about a week. about 6 months later.....same thing.....my stomach just out of the blue got really upset and i started vomiting.....there could be months i did feel better then----BOOM.......i get sick again and almost every time i do get sick i end up in the hospital because i can not stop vomiting....then i started getting more symptoms....i get these really bad cramps in my stomach that would wake me up in the mornings then from there i would get really nauseated and sometimes i end up throwing up a whole lot of bile....the cramps are really bad and i feel like they are just in my stomach/gut.... to this present day i feel like i have gotten worse....it has been about 7 months and every single day i wake up in the morning with these bad stomach cramps and i get really nauseated. the cramps can sometimes last just a few hours and sometimes they can last all day long.... they sometimes come and go every little bit....and also...my right upper quad. right under my rib cage my stomach or whatever it is gets all swollen and pushed out like you can see a bulge there and that always happens when i feel sick and get my stomach cramps. i sometimes notice i do get diarreah right before i get sick and sometimes it looks like i am pooping yellow water!!!! even after i eat my stomach starts cramping really bad.....i have had everything possible done to me by the docs i would think. they have done an mri, cat scan, scope, x-ray, ultra sound, this camera pill that i had to swallow, colonoscopy, blood work and more blood work and they still can not tell me whats wrong they say everything looks good!!!! but i just feel like as the years go on i am just getting worse i need help!!!! if you can help me find answers please please let me know......i have a six year old and a 2 month old baby and it's hard for me to be around all the time when i feel like poop all the time because of my stomach bothering me and i can't do anything but be in pain and feel ill...