First starter goes, then everything else went!

I'm in urgent need of your help! I have a 2004 BMW 325ci. My car a couple days ago wouldnt start at first, it just clicked but no drain on headlights or anything when I had the ignition on start, so I waited a couple minutes and it finally it worked. The next day my car didn't start at all and I had to push start it! I thought I needed a new battery so I went to get a new one and put it in but my car still didn't start, I returned the battery. I got my old one back and checked the charge and it was fine. I got my starter replaced and this is wut the mechanics told me. My original starter was bad because the power going to my little terminal on the starter was recieving constant power and was burning the motor on my starter because the motor was constantly running on it. So they hooked up my starter and left that wire off my new starter so it wouldnt burn the new one out. I was back to push starting my car. Then when I was driving home I felt this***** like my brakes were depressed slightly and my traction control, and ABS Brakes light popped up in my dash, then my airbag light popped up, then my A/C shut off, then my headlights didn't work, then my radio, then I tried to roll down my window but it seemed like my car didn't have enough juice, then I tried my windshield wipers and it seemed liked they didn't have any juice, then my car just totally died while driving! Help me! I've already spent 560$ on the starter! And I'm scared how much the rest of this problem could cost me!