Cursor is not responding and moving on its own

This problem started yesterday. I use an Imac and a macbook pro, and I was using my laptop when the trackpad stopped working. It was responding but the cursor was moving slowly. I decided to use my mouse and everything was fine. I thought it was just a little problem and I could figure it out later if it continued to not work. This morning I opened up my laptop and it was fine for a little bit, then the cursor went crazy. It was like my cursor was just running around and doing random gestures, opening random things. My applications were fine, but the cursor was just going around and opening them. It was very random, so I didn't think anyone was controlling my computer.

I did have control of my cursor but it wasn't completely responding. I tried shutting it down, putting it to sleep, etc. Nothing worked. I then decided to just turn it off for an hour and when I reopened it, it was fine. After a few minutes it went crazy again. I think my battery might be swollen, I don't know. Apple decided to use the smalled screws in the world so I can't open the back off, can anyone please tell me what's going on? I'm taking it to the apple store tomorrow but I want to figure out what's wrong first.

It's a MacBook Pro 13 inch

I've had it for about 2 1/2 years

thanks,

Dan