Re: Feel like I've lost the urge
No need to feel stupid, its a very valid concern.
I can't give you any first hand advice, but I'd suggest thinking about anything that has changed in your life recently... Any new stresses? Any new meds? Any new foods, beverages, supplaments? Are you feeling OK otherwise?
Personally (and I'm definitely not medically educated - so feel free to take this with a grain of salt) I wouldn't worry about it for a while. See if you just naturally get your mojo back. If you don't, I'd consult with your doctor, or possibly even a psychiatrist.... no I don't think you're going crazy, but a regular doctor is less likely to know the medical aspects behind desire, whereas the psychiatrist is an MD, but also knows all the psychological issues behind "desire".