Alt. guage discharging all the time???

drove the car to work yesterday with no prob. except the car's idle being a little low and the volt guage being on the discharge side the whole time. Later in the afternoon tried to start and it would just click, nada. Had someone jump me off and got it home, put it in the garage and noticed the car was running like crap, idle was barely 500rpms, revved it a few times and noticed it had a bad miss, ended up just shutting it off, then tried to re-start, dead, just clicking.