Sorry to hear about your husband.
I've never directly worked with this issue but I will share what I learned from herb school regarding male reproductive.
Diet is really important. Foods that support the male reproductive system are: pumpkin seeds* , sesame butter, tahini, sesame seeds, watermelon*, cucumbers*, cultured milk, fresh fruit, and dark leafy greens. (* most important)
If there is inflamation you want to work with more of the cooling herbs and if infection is involved then add something for that. Some herbs sugeested are Raspberry leaf, nettle, comfrey, damiana, gingseng and saw palmetto berries. Notice the herbs are either cooling and nourshing or more yang and firery in nature.
Saw Palmetto Berries can be taken as a tea or tincture.
Calcium, Magnesium, Vit E and Zinc are important.
'The Male Herbal' by James Green is a great resource. Lots of information. Also, Rosemary Gladstar has written on the subject in 'The Family Herbal'
If you want more information, I can list the herbs Rosemary and James suggest out of their books. Let me know. Hope some of this was helpful.