I have the same muscle twitching symptoms that you describe.
Happened after I got a food borne infection 14 months ago (that I assume was parasitic-I still have intestinal pain, a lot of gas, twitching).
I treated with herbs and Rx meds - and then about 6 months after getting the initial infection the twitching started.
Did you find the origin?
I am assuming it is some kind of parasite larva, but Dr said electrolyte imbalance.
Why now, after all this terrible unresolved infection though? It seems too coincidental.