Neuropathy in feet

Starts as a dull, bruised ache in the soles when standing. Ache builds into tingling, then warmth, and then burning sensation if I keep standing. Pain and redness fade rapidly (within minutes) after sitting or taking shoes off. Sometimes under aircon my feet will start a burning sensation. Tighter the shoes the faster the symptoms start. 6 years of IBS prior to this onset of symptoms . Otherwise fit 20year old.

EMG, blood work, MRI, XRAY, Ultrasound and countless medications. All clear, no results. Skin biopsy booked.