Up your hard liquor intake tremendously, use all the urine you are sure to produce to float out of your hole of misery. Has worked for me at every low point in my life.
You can trust this advice, I've been deployed twice, lost many friends, 1st wife did leave me, 2nd wife nearly did.
Alcohol is not the answer, it is the question, and the answer is yes. I use it as a cheap and tasty alternative to professional, expensive, uncomfortable therapy.
I hope you get out of your rut, remember, there are at least a billion places to dump semen into, finding one of those places is easy. Just put yourself out there.