It's possible that part of your electrical porblems are due to a bad voltage regulator. This is a $30-$60 part(depending on what brand you buy & who you buy it from). The ABS light issue raises this suspicion.
You mention alternator work. If a rebuilt alternator and by that I mean a good one that was designed for your car..ie..Bosch was installed, then I would hope it came with a new voltage regulator.
In closing, I would suggest that you consider that you hired the wrong mechanic. It could be argued that he hasn't done well and should be held accountable, but that really means nothing if he's unskilled and it sounds as though he is just that.
My 2 cents.