I felt suicidal and got migraines/nausea/vomiting when I was firs...

I felt suicidal and got migraines/nausea/vomiting when I was first started taking Lamictal. Then I was on a steady dose of 100mg and I felt better than I've felt in my life with no other side effects except the tendency toward minor skin irritations. I've just gone up to 150mg just to see if that's better, but I'm having suicidal urges, migraines, nausea, vomiting. I expect that will clear up soon and then I'll know if this is a good dose for me. My psychiatrist warned me about feelings of suicide as a possible side effect. She also told me that as the dose goes up, mental disorganization increases. So we're trying to find the right balance of anti-depressant effect and spaciness.