I am not saying you do not have a parasite or other pathogen issue but magnesium loss (along with the Vitamin D or other electrolytes) could be causing some of the twitching, it is worth exploring anyhow.
Magnesium loss occurs with most American diets anyhow and is exacerbated with any stressor including infections. Doctor's Best High Absorption Magnesium is a very good and inexpensive form of magnesium.