turned out i was suffering from diverticulitis
Don't waste your money. Improve your diet with more fresh fruits and vegetables. Wash your hands a LOT. Try a couple of supplements that are supposed to improve immune function, like echinachea and aloe juice. Avoid kids and college students (very buggy they are) until your immune function improves. Reduce stress.
Sometimes it is just a combination of especially strong viruses and your immune system being a little out of kilter (stress, poor eating, winter blues, lots of causes) that gets you on a roll with several bugs in a row.