Burning feet and palms. For this issue?

Asking for a 33 year old female with one daughter who is 4 year old. have a health issue and unable to find root cause for it nor the solution. having burning feet and hands severe at nights and mild in the mornings. And prickling sensation all over the body. B12 sugar thyroid ana hba1c Nerve conduction test urine  test and full body checkup is also normal. Have been to many doctor checkups and  Unable to find the root cause for this and neurologist only giving depressant tablet..she is not comfortable with those medication. Facing this issue since 3 years. Can anyone here find out what could be the root cause for this issue? Recently a neurologist has said it is small fiber neuropathy and Unable to identify the cause for it. Any help is highly appreciated. Thanks a lot!