It is now time for you to investigate Gluten intolerance.

This can cause GI upsets and vague neurological symptoms.

http://jccglutenfree.googlepages.com...eralneuropathy

Was B12 tested? What are your numbers? "normal" is often misreported for this nutrient. Did you have Vit D testing?

It is possible some of your GI problems (if they occurred only after the Levaquin use) are due to dysbiosis that occurs after antibiotics. Since you state you have used other ones as well before the Levaquin, you could have a problem brewing from pathogens in the GI tract. If you have chronic or frequent diarrhea, you lose electrolytes quickly and this affects nerves. Low magnesium and low potassium give paresthesias as a sign. Fixing this takes time and attention. You can start by eating a quality yogurt that has listed several strains of organisms to restore yourself. Or you can investigate a good probiotic product at your health food store. Some of these can be expensive.
Numbness and tingling with twitching is a sign of calcium/magnesium imbalance.