is there any migraine medications i can take while taking lithium

I am taking Lithium 200mg & Effexor 375mg and have ben told i can not take migraine medication due to taking the lthium.

My migraines are getting more & and more severe, causing excruitiating pain and temporary blindness & are lasting longer and getting more and more frequent, its affecting my work & my life.

I recently had blood tests and a brain scan after collapseing at work with the pain but all results came back negative - there answer was the same as my GP, i cant have migraine tablets while on lithium and should changing my diet.

I have since given up chocolate, sweets, coffee, all dairy products, fizzy drinks & anything with citric acid.

I'm hoping someone can help me as i really cant take much of the pain and the fact that its taking over my life.