Hey hun, sorry about the lack of spermies! I wonder why your husband has this problem, did the doctor diagnose anything? It seems like if you know what the underlying cause of the azoospermia is, then you would treat that problem and then hopefully the sperm problem will be improved.
If the doctor already ruled out everything (cancer, testicular failure, etc) and they don't know why its happening then I Would think cutting out all drugs and alcohol and avoiding the hot tubs like you probably are doing, would hopefully make a change. I don't know if the Wellman would help if there isn't any sperm at all. Sorry hun, hopefully someone else has experience with this to help!