I agree with what Glenntaj said earlier...about neuropathy from an autoimmune or toxic origin. If you have not had any antibiotics or other meds before this happened, I would focus on the autoimmune diseases at this point.

The stomach pain after eating made me think of gastroparesis. It is yet another autonomic dysfunction (like POTS) that involves a decrease in stomach motility. Wide spread autonomic and peripheral neuropathy with a somewhat sudden onset could be autoimmune. The crippling fatigue is also right along with AI diseases.

I would suggest seeing a rheumatologist. Good luck and keep us posted.

BTW, the CT will not show nerve damage either unless there is a structural problem...and I really doubt that. The definitive test for small fiber neuropathy is a skin biopsy. Other nerve testing can include EMG and nerve conduction studies.