What is going on in my digestive system?! Burping/gurgling/wind/bloating?

For the past 4 days now on and off i've had this terrible gurgly feeling in my upper stomach and bowels - lots of wind passing - lots of burping but no apparent diahoerrhia(sp?) or sickness - i have tried chalk based gaviscon and tums which are to help indigestion but to no avail. First night i had stabbing pains in my upper stomach, and then on and off uncomfortable feeling - like trapped wind really now. The pharmacist and doctor don't seem to know what's going on so i wondered if anyone else did! I am bloated to the point where i look 8 months pregnant, especially late at night and it's ridiculous considering i'm normally so skinny. I have quite a varied diet, i may have eaten some dodgy ham but that was 4 days ago now, so what is this!? I think i might have slight I.B.S (irrital bowel syndrome) but only in that i get bloated and gassy from some foods, this seems to be with whatever i eat though at the moment.

Please help if you can think of anything i can take to help - it is very hard to work and deal with the constant flatulence/burping/pain. I am also generally worse after having just ate.

Any ideas anyone? Any help will be so appreciated!