I hope that if you're switched to Haldol it works out for you. From your signature it looks like you've had some major episodes recently. I hope you're doing better now.

I'm no doctor, but I used to be extremely athletic in my younger years. Muscle spasms (including Charlie horses) and twitches can result from serious or suddenly major increased exercise, I believe. They did in some cases for me. Be sure to fill up on electrolytes if you need them.