A possibility that needs consideration is neuropathy considering the burning pain and numbness you have reported.
. Causes include
* Compression neuropathy. It is compression of nerve at any place among its course. This commonly occurs at tarsal tunnel at ankle level.
* Peripheral neuropathy
. This can be due to deficiency of Vit B12 or due to certain toxins like Heavy Metals like Arsenic, alcoholism, vascular or autoimmune
disorders. There are numerous other causes.
* Metabolic disorders like diabetes can also cause this like Diabetic Neuropathy but ruled out in your case as you are not a diabetic.
You can see the following link for more information on peripheral neuropathy
* Compression on the spinal cord or spinal nerve roots in the lumbosacral spine can also cause this.MRI is needed to confirm this.
You should wear comfortable footwear with good padding or with silicon insert and with a wide toe box.
An EMG examination would also help to reach a diagnosis.