what is causing me not to sleep?

I was diagnosed with bipolar back many years ago but never had a sleep problem like this before.  I am not manic either.  It happened when the psychiatrist took me off cold turkey of seroquel and put me on geodan.  I had been on seroquel for a year.  I did not taper off of seroquel either.  I took 40mgs. of geodan and I even took 12.5mgs. of ambien cr and still didn't get any sleep now for almost a week.   I feel pressure like in and around my brain and my eyes are really dry.  I have stopped the geodan on my own and resumed back to the seroquel hoping this would solve the problem but nope..........it is still a problem.  Could perhaps the psyche taking me off of seroquel "cold turkey" may of caused a jolt to the brain?  I am afraid that I am going to lose my mind not getting no sleep.  My psychiatrist I cannot ever get ahold of and it is almost impossible to get a return call from his nurse.  I can't find another pdoc that takes medicaid either.  I think I am experiencing alot of stress and possibly depression.  What can I do to get asleep.  I am now on 400mgs.of seroquel at night.