Won't start, lots of issues

I have a 2014 prius with about 140k miles. It has had excessive oil consumption for a while but good compression and no real issues other than some misfires (presumably related to the oil leaking into the cylinders) but I've just kept the oil topped off and there have been no issues.

A few days ago, the alert the engine was overheating came on. I slowed down and it went off very quickly, and when I got home I noticed the engine coolant was very low. I filled it up.

I was driving to work 2 days ago and I noticed the heat was not turning on so I figured I would check the coolant level again when I got there. The engine overheating light came on at one point again but then quickly went off. When I was about a block away from work the car started to make a high pitched noise whenever I accelerated and a lot of white steam/smoke starting coming from the car. I am not sure if it was steam or smoke because it was very white but smelled smoky. I couldn't tell exactly where it was coming from. The coolant was of course very low when I checked it. Maybe 2 inches from the bottom of the reservoir.

All of that made me think water pump so I replaced the water pump before trying to drive home, but then my car wouldn't start. The engine will spin for a few seconds but then give an alert about the hybrid system warning me to pull over, and the power steering alert will come on too, and then it shuts down.

I have no idea what to try or how all of this is related. Any insight would be appreciated. I'm sure I've made several mistakes so far so figured I would ask some folks who know more than I do.

 

I replaced the water pump but then it still had those issues. Do you happen to have another guess?

The smoke was not coming from the exhaust. When it started it looked like it might have been coming from the hood, and once I stopped and got out it looked like it was coming from under the back of the car. It was windy though so the only thing I can say for sure is it was not the exhaust.

What would explain the issues I've had since changing the water pump?

 

To be honest I have no idea what the EGR circuit is. I haven't cleaned it since I've had the car which has only been for
40k miles or so

 

I forgot to include this in the original message but my OBD reader just reads "Error"