1998 Ford F-150 multiple items

The other morning, my truck would start (never happens). I got it jump started. As I drove to work, about 2 miles away, the driver's side electric window wouldn't work but the passenger side did. The speedometer was going crazy and I had my headlights turned off, but they were still on, and the air bag light and 4 x 4 lights were flashing on and off. CRAZY! It quickly got worse. A couple of hours later, I started the truck and it made a loud cllicking noise, the overhead interior light started blinking and it "clicked" on each gear as I shifted from "Park" through "Drive". I was told by a major auto parts store that tested my battery, that the battery was dead. I replaced it and the truck started right up. Ten minutes later, I was sitting still with the truck off and the key out of the ignition, it started buzzing intermentingly as if the key were still in the ignition and the door was opened. Now the truck stalls out all the time. HELP!