Went to gp with slight tingling in left leg. he dismissed ms because i showed no other symptoms. chalked it up as compressional neuropathy. now my feet are burning, especially when i sit, they feel like they're on fire. could that still be caused by compr

Yes: It could be due to that, But it also could be due to diabetes, heavy metal poisoning and other nutritional deficiencies. I think you need to return or see another doctor for a complete workup including labs and possibly an imaging study on your back.

See neurologist: You might have bilateral tarsal tunnel syndrome if nerves are trapped at ankle, but far more likely is the presence of a peripheral neuropathy, which needs attention to uncover cause and control your symptoms.