y stomach had been through some problem since I was 16 (8 years ago), and I think that was due to a long time depression. The major problem was that there was always some gas coming up to from my stomach to my throat, like a burp, but not so strong. The most weird thing is that sometime when I had a headache or backache, there will also be some gas coming up from my stomach when I was massaging my back or head, and this happens more often when I am exhausted. Recently, I found out that whenever I ate something that I could not digest well, my stomach will have a gas problem and left side of my head will ache, also make me feel tired and sleepy, I even couldn t work anymore when I got that headache. If I forced my self to throw up the food left in my stomach, I will immediately feel better. Since last month, I found out that hamburger, peanuts, sunflower seeds, sausage, fries, fried breaded chicken, some cheese and seaweed will all get stuck at my stomach, cannot be digested and give me a severe headache, although I didn t have any problem with these foods before. Now seems that the only thing I can eat is bread and rice. I went to the doctors several times but they couldn t figure out what s wrong with my stomach since all the examinations were fine. I wonder if someone has useful information about this and thanks for your help!