Steve,
Do you know in fact that the medication is what caused it? Are you positive that the hearing loss is permanent? Are you currently still on the medication and what steps are you taking to reduce it on your own. I've known plenty of people who have had conditions such as high blood pressure or diabetes. A lot of it can be managed. For example, are you overweight? If so, that would be an underlying cause of high blood pressure. If you are, have you taken steps to lose weight and maintain a healthy lifestyle?
20 to 30 min brisk walk can do wonders.
My father in law suffers from diabetes, yet a few modifications to his diet has worked wonders. He's actually healthier now at the age of 65 than he has been in years.
I'm also not too sure how far you would get with a lawsuit against the doctor. Looking at a few websites, I don't see hearing loss as a side effect of that particular medication. Keep in mind that I only looked at 7 or 8 sites and I am just missing it. If your doctor wasn't negligent, it may be difficult to convince a jury that he is responsible for your hearing loss.
I'd also have a talk with another doctor about it. Perhaps this won't effect you for the rest of your life. Has a doctor told you the specific cause of the deafness. I mean besides its a side effect of the drug, but give you an actual physical reason for the hearing loss?