A likely cause of her symptoms is neuropathy. A nerve conduction test would be beneficial. I recommend she see a neurologist or physical medicine and rehab doctor regarding this for the can perform the test. Causes of this can be from vitamin b12 deficiency (which appears that she is being treated for), thyroid disease (again she is being treating for with synthroid), diabetes, autoimmune disorders. Treatment will depend on the exact cause.
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What would be preferred a neurologist or physical medicine and rehab doctor?
Both types of specialist are well versed in this. One is not better than the other.
Why does this occur only at these times and not during the day?
It can be due to use during the day causing inflammation or swelling at night leading to these symptoms
If she does the nerve conduction test can the problem be solved??????????
With the nerve conduction study, a diagnosis can be made. Depending on what the diagnosis is, treatment can relieve symptoms
Anything else you can add and thank you
I think that is where you need to begin in order to find the exact cause of those symptoms
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