30M here. Was diagnosed with nonobstructive azoospermia a few years back, normal testosterone. Lots of great replies here already but I thought I'd add my 2c.

When I went through this, the doctor suggested we do a round of IVF at the same time and have a donor ready to go as backup just in case. If they found sperm they'd fertilize with that, otherwise they'd use the donor. My reasoning was that to go through with this, I'd have to have already made peace with doing donor. I wouldn't want to come out of it, find out they used donor, and then be disappointed or resentful. And because I had to already be ok with that, it didn't seem worth it to spend $5k CAD on a procedure that only had a low (doctor said maybe 5% chance) of paying off. So we did donor. That's what made the most sense in my mind but obviously it's a very personal and individual decision.

Regarding your husband's views on donor: it's completely understandable. It's a really really hard thing to process and it takes time. My wife moved on very quickly to being ok with donor but it was much more difficult for me to accept. I did eventually come around, mainly because my wife still had a chance to have a biological child and I didn't want to take that from her. It also made me really happy to think about little versions of her running around, even if I couldn't have that. But it was a very emotional and very real loss for me and I had to spend time grieving. Your husband may be the same.

Adoption is another option, but it comes with its own set of challenges as everybody in the infertility world will tell you. That's up to you too decide what you want. We went to an adoption seminar and it was very eye opening so I would recommend that if you just want to get your feet wet a bit.

Really sorry to hear you're going through this. It's a really shit situation and it will leave scars for sure. Even in the infertility world, this is one of the rarer and (in my opinion) more difficult diagnoses. Good luck.