Update: My doctor was happy to order the MRI (he treats quite a few hypermobile). He understood what I was asking for with no problem. He is not sure if my insurance company will give me a hassle or not (we have not had the best of luck with them over the years), so he approached it in a generalized manner and is prepared to order a close up of the pituitary if there are any irregularities. Not looking forward to the cost, but I am so sick of the hormonal issues that I am experiencing.