Bizarre thought causing bad anxiety.

Hello, i'm new to this, so here it goes.  It's kinda long.  I'm sorry.  If you don't have time, I understand.

I have been dealing with anxiety since childhood i suppose.  It started when I was always afraid of my mom leaving because I thought something horrible would happen to her, and when she was late getting home, I assumed she was in an accident.  Fast forward to my early teens.  I grew up, and still am, a baptist.  We believe in heaven and hell, and that Jesus is the only hope.  One night on the way home, I start doubting my salvation.  I ask my stepfather and he says "Well, that's one thing you better be sure of."  An intense fear like nothing I'd ever felt came over me.  It was like having a bucket of doom poured over my head.  I cried. Prayed.  Everthing.  That night I had my first panic attacks.  Couldn't eat the next day, and the only thing I could think of is what if I was never saved and never could be and am doomed to hell.  Just complete misery.  I went to church that next Sunday and prayed, and my hope in Jesus was reaffirmed, and I felt much, much better.  The thought still crosses my mind every once in a while, but I shrug it and try to have faith.  It really doesn't bother me anymore and I am confident I'm saved.  Fast forward early twenties.  I am a hypochondriac.  I get a cough, I think I have lung cancer, etc.  I am working in a factory.  Very good paying job, very good benefits, but long hours and stressful.  And, I don't get to go to church, which I love doing.  I am standing there one day, and a terrible thought crosses my mind (don't know what caused it).  What if I have a split personality and that personality takes over and I spend the rest of my life trapped in my own head in misery.  Gah, what a thought.  Anyway, the more I think about, the more it takes over, and I again feel tht dreadful doom in my gut.  I cry again.  Bitterly.  I research online.  I felt like I was losing control, which only added to my certainty of multiple personalities.  I talk to my wife (fiance at the time) and she tells me to just quit thinking about it.  Doesn't work.  A month or two passes and eventually I gain control of the situation and convince myself that my life is not coming to an end.  Fast forward to my present situation.  Doing better with the hypochondria, but I had another sinister thought, from a dream.  The dream is this.   I am volunteering for some experiment that will help save people.  The experiment will be very painful and push me to my mental limits. (How does that save people, who knows?) Anyway, it begins.  My wife it doing it with me.  It is not painful at all.  It's pretty stupid really.  Youtube videos and projections.  I wake up from my dream.  The horrible thought enters my head.  What if this is the experiment.  What if some scientist somewhere is experimenting on me in real life.  Doom.  Doom.  Doom.  I freak and start thinking of all the reasons why that can't be happening.  Dreams aren't real.  But, in the great sceme things, I really do not know for sure and can't prove otherwise.  (btw, that movie "Inception" freaked me out)  Anyway, I am about a month in and I still have this horrible recurring thought.  If something strange happens, a coincidence of some sort, I automatically think "what if this is a test?!" and then I freak out and doom and anxiety take over.  I hate it.  I wish I had not ever had such a relentless thought.  I just want to be happy and not let such weird thoughts take over.  I worry that I'm Schizophrenic.  I worry that my condition is going to get worse and that this thought is going to become a self fulfilling prophecy.  It scares me.  Any encourgment, or advice?