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Kishuy Ladaas would be forbidden if it would result in spilling seed. If Rage is correct that you have sperm but just a low count, you would be no different then anybody else. I can't think of anywhere where it discusses your question, but you realize there's no chance that it's permitted.

I'm sorry to hear about your condition.
I think the shulchan aruch says it's forbidden for us to even arouse ourselves if it's not for relations with our wife, so tell your Y"H he can't lead you down that path...

If we had the technology 3500 years ago, I wonder how they would have diagnosed our patriarchs?

Why would you want to have a hetter to masturbate? What do you think about when you are doing that? Do you find it a healthy thing? Are you powerless to stop? Does it get in the way of "normal regular people" functions? If you have a problem stopping then you have a problem. Whether or not its assur or muttar is really not the issue.

If you have a problem with s*x or lust in any way, there is an answer - you need to want the answer though. Its not all easy but there is a solution. Check out The Solution from the SA White Book. I can send you the text of it, I keep it on my phone so I can read it regularly.