I have been on lamictal for a long time. I never had any side effects at all. Are you ramping up very slowly? Otherwise there are side effects you can get including a severe rash. If you get any type of rash call your doc immediately. I have not heard of intenstinal problems with it but as with any med they all work differently in different people. Call your doc if you don't get any better. I hope your side effects go away quickly.