The only difference an fMRI would make is it can track how your brain functions during specific tasks. They give you mental tasks and watch to see what part of the brain lights up. They know what a normal brain will do and chart any differences.

fMRI is not a standard procedure yet. It is primarily used in research settings. Getting into a research study can be difficult. There is a web site that takes applicants for some of the studies. I don't remember where the web site is. maybe googling will find it.

I just googled fMRI and research and found that Columbia University in New York is doing clinical work. There are quite a few centers doing research and possible clinical work.

The question is this: If they find something, what can they do to help you with it? Finding the fMRI center that has some understanding of problems like yours would likely be important.