As i have said before hereby, some natural products and alternative home made methods existing. You may be strenghten your immune system and body health including you penis with these product. There are some links here in this web site.Have a look at there.
http://www.canserious.com/special/special.html
My be get an idea about it..
You want complete bloodwork including your sex hormones, adrenals and full thyroid panel. Low testosterone, high/low estradiol, sluggish adrenals and thyroid problems can all cause this. It is also the ratio some hormones have with others that gives you balance so to speak
http://www.medhelp.org/forums/MensHealth/messages/1970.html
i don't know why this is happening you should go to a doctor.it could be due to being circumcised if you are as circumcised men get older they lose feeling.the pain could be alot of different things such as a hernia.