The affects of ecstacy while on lamotrigine (lamactil)?!

I have taken it once and had a lot of fun. Its been sometime since I've had some( 1yr), and it will probably be a long time before I might try it again. I just started taking lamotrigine for bipolar disorder and am up to 150 ml. I realize the dangers of doing it on its own, I'm really curious what would happen if I were to take E and be on my presc. meds. Someone who has done this is especially encouraged to answer.