My 94 Celica gt w/ 147,000 miles

Ok here is my problem. First when I was driving home one night on the highway my engine just stalled liked the govenor kicked on and it dropped down to about 25 mph. Ever since then I can not take my rpm's up past 4000 if I do it just bounces the needle and shakes the car and kinda in a way sputters like it wants to take off but cant. Second when im driving or even when im stopped the car shakes very bad like if you were driving in a rocky field. Now just recently when I go to start the car when I first try to turn it over it screaches like it does when you turn the key when the car is already running. So please help.