Hi Christinek, sorry that you are having to go through this
What were the numbers from your husband's semen analysis like? I'm assuming they were really low based on your fertility specialist's comments, but were there any live sperm at all? With IVF with ICSI, you should only need a handful of good sperm to fertilize the eggs with. If the analysis showed no sperm (azoospermia), sometimes it is still possible to retrieve sperm surgically using a TESA procedure and then using any sperm found for IVF with ICSI. You are not guaranteed to find sperm with this procedure though.
The urologist will try to find a cause for the high FSH. It could take a while to get the results back from further testing, especially if the urologist orders a genetic test. Unfortunately I don't think most causes of high FSH and no sperm are reversible. But, the urologist is the expert and should be able to tell you whether it'll be possible to improve your husband's sperm production.
In our case, my husband had sperm concentration <1 million and 7% motility. His bloodwork showed he had low testosterone, but his urologist wasn't able to find a cause and basically said we couldn't do much, if anything, to improve his sperm count and IVF was our best option. We went ahead with the IVF and the fertilization with ICSI ended up going ok
Me - 32 DH - 35
Started TTC Jun 2013
Diagnosis: Low sperm count & motility
IVF #1 - Aug 2017 - Antagonist Protocol
18 eggs retrieved → all mature → ICSI'd 16 eggs → 12 fertilized → 10 blastocysts
froze 9, transferred 1 - BFN
FET #1 - Oct 2017 - transferred 1 embryo - BFP!!
our son was born July 2018
FET #2 - hopefully Mar 2020!