Need a mechanicS opinion/advice Alternator or No?

[jasonmar.88]

My Yaris was hit in run (L) corner rear bumper while parked, not hard but enough to crack the bumper, it could be a coincidence but that's when it all started. My battery light started to sporadically appear and disappear on the dash board and did so for a couple days. I took it to O"Riellys and the battery, starter and alternator tested fine. Confused because it still drove great, until the 3rd day, while driving my kids to school, I lost power steering, and the ABS light along with the battery light and break illuminated my dash board, followed by loss of dash board lights, stiff to no breaks and loss of power, it was a hot mess. I pulled over turned the car off then back on and like magic all was fine. Until that evening when it happened AGAIN...I turned my Yaris off, then back on and it was hesitant to start but within 5 minutes it did...PLEASE HELP, has anyone had this problem? I am lost as to how to fix it.
:UPDATE:
***Yesterday I drove perfect with the exception of battery light sporadically making an appearance or two, then today just now after picking up my kids from school, AGAIN battery light, no steering and now my OIL LIGHT is making an appearance and this time the car wont start...unlike the other time when it did. Just a note: I have maintained the car and the oil is on point.***
I'm not a mechanic, I am a mom, so I called the Toyota company and the gentleman said w/o looking at it he thinks the alternator is "going" bad. When I turn it over it just clicks. He suggested I bring it in but the cost is like 150.00 just to have it looked at / diagnosed and its to close to Christmas for a bill that starts at 150.00 I am just hoping someone can tell me if the alternator could have have been "going" bad and that's why my cars been acting possessed?