I know it must have been crushing to get that news about hubby's sperm, but in some ways it is good news that you have a clear reason for why you're not getting pregnant AND that cause is usually easy to fix.
It's hard not to worry about the worse case scenario, but the odds are really greatly in your favor since he was able to get you pregnant in the past.
Another good thing is your hubby is really motivated to fix the problem. A lot of guys are pretty resistant to admit that anything is wrong in that department and refuse to go along with treatment.
The Fertilaid supps worked for me and my hubby. We were trying to conceive our second child for 2 years. I had had all the tests, a lap, tried clomid and injectibles. Everything looked perfect with me but we still had no success after the lap and the fertility drugs we used after. I decided we needed to quit seeing the RE and we tried the Fertilaid as a last ditch effort. Less than a month after he started taking the Fertilaid supps, I started noticing significant changes in his "output" and other areas, and we actually got our bfp that month.
My dh was on the whole Fertilaid trio--Fertilaid for men, Countboost and Motility Boost. It is definitely pricy and seven tablets to take a day, but boy am I glad we gave it a try. I was pretty skeptical at first.
If that doesn't work, then there are other minor fixable issues that can be addressed. Stay strong and don't give up hope!