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  You don't mention what kind of specialist you've seen and without knowing that, it's hard to advise you in any but the most general terms.   Regarding your feet - changes in sensation can be caused by back problems or neurological changes (like e.g., neuropathy), so if you haven't seen a neurologist or back specialist, you might want to try that.    You also don't mention whether the tingling in your fingers and your joint pain are new or have been around as long as your foot issues, so I'm can only be very general in answering those questions, as well. The tingling in your fingers could be coming from you back, shoulders or elbow.  You could have moved wrong without noticing and perhaps have a pinched nerve somewhere.  Or it could be caused by something else entirely - your doctor might be able to do some tests that would narrow it down.  The problems with your feet, your fingers and your joints may be related or they may be caused by different issues.  The best I advice I can give you is to keep going back to your doctor or ask for help.  Sometimes, it can take a while before you can get a diagnosis.