Kirton, I am sorry that you are feeling so sad. I remember how I felt when I found out that both my dp and I are subfertile. (We knew about me, and were having investigations because of that, but I just wasn't prepared for the news that my dp had low sperm count and motility too.) I cried a lot when I found out.
It was a horrible, lonely, all-consuming feeling of fear and uncertainty.
I think it is also very hard for men to be told that there is a problem. I know that my DP felt that he had let me down. I imagine that most men would struggle with the idea that their sperm was below average. Is your DH able to speak to you about it? Or does he not want to talk about it at all? I found that talking to my DP was really important, even though he found it hard.
But you definitely need to get support from other places too. If your DH really doesn't want people to know in RL, I'd really recommend getting support from an internet forum (the Fertility Friends website is pretty good, as well as MN). I know I really needed to talk about what was happening. And whether you tell people in RL or on the net, I found that people really were rooting for us. Our friends and families were very supportive. I was really surprised about how many people I knew who turned out to have had fertility problems of some sort.
I also found it helpful to think about some of the positives - in our case, we knew what the problems were, there was a treatment that might work (IVF using ICSI), and I was relatively young. It sounds as though you might be in a similar position on these points - with the option of the surgery (and Zita West) improving DH's sperm, too.
Good luck. We're here if you need us.