Tom,

The folks at the National Archives will assist in locating and bringing you material, but will not do actual research.

Your best bet would be to find a local researcher for the work. The folks that provide service records on these message boards may also conduct research for you. I have no idea of their fees. See: http://history-sites.com/research/

Be advised however, these medical records are found in large ledgers, being mainly indexes with not too much information. Difficult to slog through, and in some cases the ink having faded.

Best wishes,

George Martin