Hello and welcome to JustAnswer!
What kind of problems are you having?
Let's try disconnecting the battery and see what happens. You've definitely got an odd chain of events there. The battery is in the trunk. Open the trunk and pull up the lower panel and you'll find the battery on the right side in the rear. With the key turned completely off disconnect the battery for a couple minutes and then reconnect it and see if the problems go away.
Try pushing the button on the dash with the key in the on position. If that doesn't work then you can go in through the back seat. If you lay the seat down you can crawl through and grab the glow in the dark emergency release handle on the trunk to open it from the inside.
Do the power door locks an interior lights work ok?
But the engine still starts and runs?
Do you have nice bright headlights?
Let's try disconnecting the battery and see if that helps, but it may not. If that doesn't help I think our next step would be to do some electrical testing with a voltmeter.