Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
A small yeast patch near your panic cannot cause such burning over such a large area. Probably there is some neuropathy, probably a compression neuropathy which is leading to this kind of pain.
You will need to do a complete MRI
scanning of whole spine to find out the location of compression.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.