First off, what's the thing doing? Secondly, when was the last time the filter was changed? Has it been slipping? Does it get worse or not want to move when it heats up? When did the problems start, and how did it act when they did?
Also, if it's not far from your house, and not needed to drive immediately, I'd tow it home before I made any snap decisions. Before you panic, it could just need a filter and fluid change. They get clogged sometimes and the thing won't even move. Keep checking and posting.