Complaints, anyone deal with this?

I just can't help but analyze anything I do or say lately.  It's like my mind is impossible to shut my mind off.  I'm always thinking of something completely random and most of the time it has nothing to do with what is going on at that time.  It's just pointless worries or "should" thoughts that consume me.  For example I'lll be sitting watching TV and I'll be thinking of....(I'm in this current situation because I shut my friends and family out, "if" only I would have let them in closer and been more outgoing I wouldn't feel this way.  I "should" try and do that now and see if it helps me get better).  But nothing I seem to do lately really seems to work.  I worry about the stupidest things, how I'm sitting in my chair right now for example.  My leg and ass muscles, as weird as that sounds lol, are like completely tense.  And I feel like I'm not relaxed I just feel myself just all tensed up the majority of the day.  I clench my teeth and grind them the majority of the day as well, and I just feel like I'm in this fog.

The worst part?  Before all this anxiety I used to love taking naps when I had nothing to do and it was a great time to catch up on some rest and also kill some time.  Now in the afternoons when there is nothing to do, I can't even sleep.  I can't even sleep at all the last week without taking my ambien, which is sort of a setback for me because I was getting to the point where I could atleast get like 4 hours without it but lately I can't even fall asleep without a sleep aid.

And all of these feelings and problems seem to be happening in the last month, where I have also coincidentally decided to stop seeing my psychiatrist and to go back to my old primary care doctor to have him refer me to someone he suggests.  I never did really like my current therapist, come to think of it I only really did like 1 out of the 4 of my therapists but she was just too expensive because she was outside of my healthcare coverage.  It makes me question my decision to switch again, makes me feel like I might be making a mistake in doing this.  But I just know that I've been seeing this therapist again for the last 3-4months and have been taking the zoloft as prescribed, and it's just not working out at all.  Really running out of answers and ways to fight and bring myself out of this rut.  Lately I've just been trying to just relax and wait out this anxious time, but all that's been doing really is getting myself to gain weight and become really lazy.  Atleast a few months back I was working out a little bit and trying to fight this.  Since a lot of people on the forums were saying that they thought that maybe I was trying to fight it too hard and thats what was leading to my high anxiety levels, I tried to take this approach.  Fifteen lbs later and still anxiousand having sleeping problems, I don't think that's the trick either.  Gotta be something that can help me get out of this rut.