Some people are more prone to damage for some reason.

There is a book written about this by Stephen Fried called
Bitter Pills. His wife developed a permanent seizure disorder from ONE dose of Floxin. Floxin is not used much anymore orally. But Levaquin is a chemical derivative of it.

http://www.stephenfried.com/bitter-p...pillsbook.html
This is an interesting book, I have a copy of it myself.

Doctor Cohen suggests magnesium for fluoroquinolone side effects. And with your hubby's high C-reactive protein, you might try high dose Vit C. There are studies showing Vit C will lower C-reactive protein. Also in patients with potential RSD (a form of neuropathy) high dose Vit C works as well.
I'd use Ester C form (easy to tolerate) and at least 1000mg a day. Discuss this with his doctor to see if it would interfere with his other meds.

This is a PubMed paper on C-reactive protein and Vit C:
http://www.ncbi.nlm.nih.gov/pubmed/18952164

I hope he is not on a statin drug at this time...you didn't mention any. Statins are very hard on the nervous system and cause neuropathy in some people.