Why does my car make this sound?

When I start my car, it turns on then I turn the AC on and then this little squeaking sound comes on. I drive slowly and it's still there. I speed up and the sound gets even louder and in a way sounds like if it's going to explode. Then it'll go away eventually until I start my car all over again. If I turned my AC off at anytime, that sound goes away. So it somehow corresponds with my AC but what exactly could the problem be? Also it's a 2002 Honda Accord LX and I've only had it for a year now

Should I sale my car and get a new one?

I have 200 Honda Accord and it keep having problems.5 months ago I had to get a new radiator, then. 3 months ago j had to Change the ignition switch, 2 weeks ago I had I to change the radiator fan and thermamitor, and now they saying I need a new transmission and will need a new altinator soon. So should I sell my car for whatever I can get for it or should I put more money into it and hope nothing else goes wrong.

Maintenance required light flashing?

I have a 2002 Honda accord. It's around 194,800ish miles.
The maintenance required light flashes for a bit every time I start the car. Any one know what that means?

Not due for a tire rotation. Probably due for a wheel alignment.
Next oil change due at 195,300ish.

What's the difference between gas grade?

Especially talking about the 85 and the 93 ( usability referred to as special and premium ) . Is there really a significant difference or have I been wasting my money on premium gas?

And for people who knows cars, I have a 2011 Honda Accord SE ( special edition) . Is buying premium gas even necessary for the car? Or would special be at better fit?