What Causes Numbness In Right Side Of The Body?

I started having symtems of numbness on my rite side, with anxiety for 30yrs. And after going on zoloft, symtems have become severe, for over a year and a half,I have a constant numb feeling on my right side, I've had mris, and every test you can think of, everything comes back normal, if I do kiegels, poop, I feel tingeling down my right side and I have tingling in my buttock before bowl movements! Frustrated because I don't know what's is going on in my own bodyl