Thanks for your query.Based on the facts that you have posted it appears that your husband is on Testopel .
are known to lower sperm count
by inhibiting the secretions of Hormones LH by Pitutory gland.which plays important role in production of sperms.
This can be recovered in 3 -6 months after he stops taking Tesopel
Dr has advised him surgery however since you have not mentioned anything about surgery in detail, I can not make any comment about surgery,