Now this is only my opinion, but yes, I think you jumped up to too high a dose too quickly, and might be suffering from too much serotonin (serotonin syndrome). Even though you can't get to your doctor for a few weeks, I would still call him/her . . . if you don't lower the dose at all, maybe you need to supplement the Zoloft (temporarily) with Ativan or some sort of benzo to take the edge off.
And yes! I absolutely do know what you mean by being shaky and wanting to crawl out of your own skin. I jump around, and go ack, ack, ack, and shake my arms when I get that way. Again, I would call the doctor--they're always too busy to see us, but at the very least, they owe you the phone call.