Am I Going Insane?

Ever since my recent panic/anxiety attack while taking an afternoon nap, it has been somewhat difficult for me to get a good night's sleep (or even falling asleep for that matter). I'm afraid of experiencing another attack. I'm afraid of laying myself down in bed and having those few minutes to think before actually falling asleep. I'm afraid of relaxing and actually letting my mind wander since it could possibly lead to me thinking about death, therefore another attack.

Like I've said before, I'm not afraid of death itself. What I'm afraid of is the idea of the unknown and its uncertain arrival. In truth, I am just as afraid of consciously living for an eternity as I am dying unexpectedly (whether it be tomorrow, in a few years, or a few decades). I don't know how to explain it; the concept of being eternally conscious or unexpectedly just going black makes my stomach sink. I tried to Google what I am experiencing and the closest thing I could find was something called "thanatophobia," the fear of death.

"People who are highly intelligent and inquisitive are often at greater risk for this type of thanatophobia, as are those who are questioning their own philosophical or religious beliefs."

Could that be true? Am I developing some sort of phobia or am I just having the occasional panic attacks?  Could being quite intelligent and so desiring of uncovering the unknown cause such a problem? Sure, I would say that I've been questioning my religious and philosophical beliefs, but what gay young adult/teen isn't? I am concerned that I'm either going insane or I'm overreacting. Nonetheless, my recent experience(s) has led to my insomnia.

I need someone to talk to, not a professional, just an ordinary person. I don't need some individual shoving the DSM-V down my throat along with a few prescriptions. I just want someone to talk things through with. I want to be reassured that I'm not the only one in this world that has experienced these sort of thoughts. Whatever "this" may be, I don't want it to progress any further.

I guess one must also consider the fact that I've been cooped up in my parents' house all alone for the past week or so. I have only left the house two or three times in the past week, could that possibly have something to do with it? Perhaps I've just had too much time to think.