Hm, difficult.
Actually I do understand that, although I think that some part of your confusion is due to the upside-down-ethics and behavioral standards in your society. If you don't feel a need to have sex, that's not necessarily a bad thing, the over-emphasizing of sexual activities in modern societies actually is a sickness that destroys people's health if you'd ask me.
Lack of emotions can be due to a trauma. Actually it is horrible to tap into some kind of emptiness (or other "unusual states) if nobody prepares you for such an experience, or can help you afterwards, and panic is a natural reaction towards this.
I think most of your experiences and bodily as well as psychological reactions might be very natural things. It's just that your society lacks knowledge about such things, so you don't know how to handle it. Well - you'll have to find a way to get used to it, I'm afraid. If you ask me - sorry, but "No", there's no way back, there's no way to stop it, and the more you try to avoid it the harder it gets and the longer it will take. Is this helpful to you?
Maybe first you should train yourself to not kill yourself
What's happening to you might be inconvenient, but not necessarily dangerous, or a bad thing ;-)
So, chin up, don't stress yourself. And if you don't feel anything, then first don't try to force it and accept the state as it is. My experience is that there will be some timepoint in which you'll brake down and cry like hell, and if you survive that things will slowly start to become better. But, and that might be something that's hard to understand for people who are younger than even 20 years .. some things need their time ;-)
All the best to you!
PS: Sorry, didn't read all replies in this thread in detail, so sorry if something had already been said.
PPS: And no, meditation after masturbation is not dangerous ^^ It is just like trying to lit a fire (what you're doing during meditation) without any fuel with which you could start or nurish this fire. And energetical damages won't happen to persons without training, so relax about this
