Hi Steve, Ok you can go get tested or just try some DHEA, its an over the counter hormone, but please read up about it first, as it can have the odd funny side effect with the odd person, but I'm 65 and have now been on it for over 2 years, it will boost you testosterone, lift your libido and kick up your energy levels, and to help it you could have some tribulus its a herb but runs along the same lines, other things that may help are Cayenne, for your blood, it cleans it, Ginger also for your blood, and Green tea, very good for your blood, and last good old Garlic, all these will help and a cheap way to get you horny again, if you need more info get back to me.
Good Luck
Cold shower, among many benefits, increases hormone level.
To enhance your sexual urge, you may Google, male deer exercise,kegel exercise,Inner prostate massage, External massages: External abdominal prostate massage,Anal peripheral prostate massage, Inner thigh prostate massage and peineum prostate massage. All four massages are given under external prostate massage.
For overall health you may do cold shower. To see important article on the subject visit MH-Chronic pain couch group. search through hydrotherapy. Shower is like an instant Mood elevator.
You may want to see your Dr to have your hormone levels checked.