Man I can take the heavy duty anabolics and handle a truckload of androgens like a rock. But my diet is so tight and digestion so steady that almost anything I add or eliminate I can feel. And I can tell you for a fact because I've tried it that when I take 5gms of creatine every morning, within a week to ten days I will have put on 10lbs of not good weight, be bloated with gas, BP increase and only get a week or two of increased reps or poundage before I give up on it.
I'm going to try less per day and split it up. See how that goes. It does have great benefits but like you say, if I can't handle it anymore, I can't. But I haven't given up on it yet. But if I do, I have options.