I have had pain in my right lower back & hip for over a year & a half. My doctor thinks it's my Si joint, the CAT Scan did not show anything, I've done physical therapy, wear an si belt, take tramadol daily & lortab for extreme pain days but have not seen much relief. I just had x-rays done & suppose to go for an MRI. My question is if the MRI is necessary to diagnose & treat my pain? My co-pay is large for it & I already have a lot of medical costs. Also what are all my treatment options to get rid of the pain, it is pretty severe & I can't deal with it any longer. Thank You.(I'm a 31 yr. old female, three full term pregnancies)