[Slam]

Is the cooling system getting over-pressurized? What you're describing could be a bad head gasket - I know this because my car behaved exactly as yours is now. I replaced the radiator and that helped a great deal but things didn't return to normal until I did the HG. Of course, these systems are completely intolerant of air in them. I'd bleed it every morning until I was sure the air was out. You can also give the car mouth-to-mouth by blowing into the header tank with the bleeder off. Just be careful. YMMV!