Engine code light flashes and goes on and off

Ok I have an 03 Cadillac Deville with 130000 miles on it. It's in good condition. Ok well, I had no service engine light before yesterday. My cruise control all of a sudden stopped working. The light would come on when I tried to set it but it would not engage. So I thought maybe it was a fuse issue so I open up the fuse box under the hood yesterday where it was raining a tiny bit before and it was pretty damp out. All I did was take one fuse out and looked at it and put it back in. The fuse box was open for like 15 minutes I would say and I put the cover back on and didn't start my car or anything. A little tiny drop of water dropped on top of a fuse, like the red part where the number is and I wiped it off. I put on cover after that. So today when I started my car in the morning the engine light was flashing, my car was shaking a little bit, and my windshield wipers would not work. Wouldn't even move at all. I had to go to class so I drove and the engine would shut off but it would come on flashing for 20 seconds and shut off. After my class I started it and the engine code wasn't there right away but when I went into reverse and then put it into drive to drive away the light came on flashing and the car would shake a little and stumble a little bit. I would continue to drive and the light would shut off and then it came back on flashing and then it stayed on solid after that until I got to the bank. I shut it off and when I came back out, I turned the ignition so all the lights came on and when I tried to start it, nothing happened. It wouldn't even try to start. So I left it there and came back half hour later and it started and the same things were happening. I checked the codes when I got home and these codes came up. And again these codes are all new, Ive never had any of these codes before. They are P0202, P0208, P0300, P0443, and P0615. Ive never had any of those. And then my miles per gallon average number and miles driven on the trip went to 0 like it reset. I would guess its something electrical when I tried messing with the fuses but I'm not exactly sure. I'm going to have it looked at soon and will not be driving it. It literally drove perfectly before all this. So just wondering what it could be and what I should do? Thank you!