What symptoms did your child have with Abdominal Migraines?

My daughter is 5 years old. She has been having spells for over 2 years now. Her body wills start trembling. She knows what is going on the whole time. We have been to neurologist and everything is clear there, we have been to the cardiologist and everything is clear there as well. We are now seeing a GI specialist and she was constipated really bad and we have her cleaned out now and the spells have gotten less often but she still has some sometimes. The doctor now wants to try her on some meds for abdominal migraines. My question is does anyone have a child with these and what are their symptoms, does your child tremor with these?