Yes, I am thinking this is infectious. Perhaps going to an infectious disease specialist may help.
The only other thing that causes numbness and weakness besides some infectious agent would be organophosphate poisoning.
This list of symptoms of chronic exposure, seems to fit your
descriptions:
http://www.drmyhill.co.uk/article.cfm?id=291
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Weezie looking at petunias 8.25.2017
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