It can be very difficult to isolate what is causing your problems.

But right off the bat, I will ask what antibiotic you were given for those 2 respiratory infections? Was it a fluoroquinolone? Cipro, Levaquin or Avelox? Those drugs cause nerve damage in some people, and it can be quite long lasting too.

There is much controversy about overuse of antibiotics today.
Long term use, may damage your mitochondria. (as in Lyme treatments and acne treatments). Mitochondria are derived from ancient bacteria that became symbionts with mammals. And the antibiotics kill invasive pathogenic bacteria by disrupting cell walls of bacteria, and so therefore damaging mitochondria in cells which are the energy producing organelles in all our cells. Short courses of antibiotics are less problematic, but in the autism community there is research showing chronic ear infections treated with antibiotics in children may lead to autistic results in some people. Therefore today antibiotics for children are discouraged unless something really intense is going on..like abcesses, mrsa, etc.