Lost power, tested alternator (passed test 3xs), won't run unless you jump.

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Recently I lost power when I drove over a small bump and then had to pull over as the computer system was freaking out and car wouldn't start without a jump and wouldn't stay running and after jumping it flashed "ALTERNATOR WORKSHOP!". First thought was that the alternator could be bad, had battery tested, it was no good replaced that, took out alternator tested it 3xs and passed each time. Put the car back together and car worked. Fast forward 2-3 weeks and it runs out of coolant again (just bought the car in September 2014), and the car does the same thing and flashes "ALTERNATOR WORKSHOP!" To make matters worse, the oil was checked and it appears to be burned up. The oil was checked 2-3 weeks ago and was fine (no burning oil smell). Also, heat isn't working properly, could be non-related. Please help!