A health question plz help?

ok i am 20 years old and i am having some problems and dont know what they are.well i have been having this pain under my right ribs for a while like 2 months or so its not so bad i want to cry its just there and wont go away well it went away for a while and came back again i get headaches alot but always have its been making my stomach upset and i am having alot of gas i thought it was my gall bladder but my doctor did a cat scan and blood work and x ray but it was normal not only does it hurt under my ribs but sometimes its in my lower back and sometimes it goes to the left side but they keep saying its nothing but it something and i want to know so do you think its my gallbladder and no it doesnt get worse after i eat i just feel really sick after i eat the pain is almost always here plz help if you can. what do you think it is?