1998 Buick Regal bumby start up

My car is leaking antifreeze. But I dont see it on the ground. I have to fill it up every once in awhile. Awhile back I flushed it out and put napa orange antifreeze in it. Now its temp is raiseing alittle bit?
and
when I start my car up. It looks like its runnin at 600 rpms. When it useally runs around 1000rpms. But when I put it in drive it starts like hopping. And makes a bumpy type sound.
and
when i`first got the car. When I turned it on. I couldnt even tell it was on when it was runnin. It was really quiet. Now its kinda loud
and
there is a very high pitched sound comeing from the rear end. My friends say its the fuel pump. Like it makes the sound when im sitting still.
and when I turn my wheels. I can hear a squelin sound