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What you are describing certainly does sound like a neuropathic type of pain. Even if it does not shoot down your leg anymore.
WHen the sciatic nerve is inflamed it can cause the pain in the buttock.
You need to be examined by your general provider especially as the pain/burning sensation is spreading to the pelvic area, it means it is getting more involved.
Sounds like you do have a nerve compression. I don't think your GYN would be of any help with this type of condition so I would definitely start with your general provider for an extensive exam.