Can a clogged catalytic converter be cleaned or does it need replacing?

What is your question?

My car lost power going up a hill. The RPM went up to 3-4 and the speed decreased from 70-30 MPH. The car then started again and I got it up to about 50 and then 70 but then back down to 30 and then eventually the car would not start at all. There was no fluid loss and the temp stayed normal. I just spent $470 for an oil change and alternator replacement 2 days prior to the car breaking down.