Audience symptoms and conditions

2 yrs. ago my husband had been on Vancomycin for an infection from a hip operation. He had an allergic reaction and was given Levaquin in the ER. Not long after the dose was given, he was not able to walk at all his fever spiked and he said he was blind at one point. It did not last but since then he had been slowly declining. He has trouble with his inner ear balance and he can hardly lift his right foot to clear the floor. He bearly feels anything from the knee down on both legs. We have been to many specialists/neuros, MRIs, nerve conduction test and there is nothing to show what is the cause. Can anyone tell me how we could find out for sure if Levaquin may be the culprit.

Sue