Dont despair too much, you come across as pretty typical OCD. I can say I've been through a lot of the things you've experienced personally.
OCD is all about possibilities, and that is what this illness ultimately boils down to. "What if I self harm?" "What if I lose it and kill myself?" It's all about risks. Most people never concern themselves with risks... which is why OCD can be hard because we have trouble interpreting all this and it magnifies these risks in our minds. Sometimes OCD can extend to impulse control, like the things you do with your eyes. I had costochondritis (inflamed chest wall) not so long ago, and I delayed it from healing because I was constantly putting pressure on my ribs for a reason that was beyond me. So yes, this is normal.
A lot of people with OCD tend to think spiritually and have an abstract view of things. I sometimes think this more to do with their level of intelligence (which is generally very high) rather than their OCD. So the obsession with death/afterlife is not strange at all (and is far from uncommon). It's something most people think or worry about, but our OCD drives us overboard on it. I went through a stage of the "death" thing, and it IS troublesome. Depersonalization is not a nice experience... but it is a vital coping mechanism your brain induces when you try to overload it with too much. It's your head's way of reducing stress and anxiety. Its telling you to quit thinking so damn much.
I'm sorry to hear that you feel you cant talk to people close to you... it's the same with me. Only an OCD sufferer could ever fully understand what it is like.
This may all be down to the meds at the moment... especially if you have been stopping and starting them. SSRI drugs have quite a powerful effect on the nervous system, and in turn the brain, so it all takes to time to adjust in there.
Well, I hope you feel better about things soon. I'm sure things will settle down once the meds have taken full effect.