Yeah, coffee's hard to give up physically and psychologically. I love coffee, but I don't like the crashes afterward. If I drink a lot of coffee for long enough, I don't get the coffee high anymore and just end up exhausted all the time. So, I try not to drink more than a few cups a day. In your case, can you cut back little by little until you're at a level where your coffee consumption doesn't jack up your GAD and tummy troubles? And I mean, cut back slowly - say, 1 less cup a day for a week, then 2 less cups a day for a week, etc. That way your body can adjust and maybe you won't have to sleep for ten hours in the middle of the day.