grublet

So I just sunk $1300 into replacing the head gaskets on my 98 Legacy Outback Limited. Got the car back and everything was fine. Drove it up north over the weekend (~200 miles) and on the way back the engine lost power while cruising at 70MPH. It sort of lurched forward as if I were running out of gas (which I wasn't). I attempted to start the car after this and the AT Oil Temp light came on and flashed 16 times. I drove about another 1/4 mile before it died again. I got the car towed home and figured I'd take it to my mechanic the next day. Well I tried to start it and now I have nothing. No crank, nothing but a faint *click* sound when I turn the key. Anyone have this problem happen before? I can't think of anything that would cause my car to both die on the highway, trigger the AT Oil Temp light, AND no crank no start afterwards. But maybe the problems are unrelated. In either case, I'm kind of at a loss of what to do with it at this point. Any advice is appreciated.