When you say that if you eat the wrong kind of carbs (food) that it makes you sick: what kind of foods do you mean? And, what are the symptoms of illness that you are refrerring too?
When I first started taking metformin, I felt a bit nauseated now and then. I had other odd symptoms that I don't know if they had anything to do with MET. THE GOOD NEWS is that since I have been on MET and watching what I eat, my sugars have gone back into the normal range (4.9 to 5.2). If they go down too far into the 4.0's, I feel very hungry and weak; so. I adjusted my food intake and that helped a bit.
I had pre-diabetes (diabetes runs in our family) and had other health issues that seem to be better now (ie more regular menses). I was taking 750 mg's (250 x 3 a day); that was upped to 1000 mg; then 1500 mg with dinner only, becuz my lunches and BF'S were small and that made me feel ill. I found (for me personally) taking the pills with dinner only made me feel a lot better. Becuz my sugars have stabilized, I have been able to cut back to 500 mg.
I think my doctor wanted me to stay on the higher dose to help me lose more weight, but it made me feel nauseated, weak, shakey, and just plain odd. Some people told me that MET makes you go to the washroom more: both #1 and #2. A couple of people have told me that MET can be hard on your kidneys (one possible side effect), but my doctor never told me that, so I will ask him about it the next time I see him (becuz that is important to me).
Right now, I am having no problems with the MET; but my weight-loss has slowed down, however, I have lost 12" overall from July 07 'til Dec 07 and lost one size in clothing, and my weight is stable. I am happy with that; I am thrilled that my sugars are normal and stable now too, and the MET along with healthy eating habits helped that I'm sure.
You can hit stalls and plateaus, but as long as you are losing inches or sizes, and/or a lb here or there ... you are still losing. I agree with KAPLODS that we tend to be impatient when it comes to weightloss. I know for me now that I'm in my late 40's, it seems to come off much slower. Some people believe that the longer it takes to lose the weight, the longer it will likely stay off, but some people are too impatient for that theory/method.
I still have a long way to go; but I think it's important to just keep on, keepin' on: in other words ... DON'T EVER STOP! After all, this is supposed to be about healthy weight and good health, for life ... right?
Hope something here is helpful ~
ROSEBUD