Occasionally when changing speeds, its like my car get stuck. The Rpm get extremely high and then my car slowly moves and starts to slow down. What issues could I possible be facing? on 2004 Mercedes-Benz C230

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when driving it starts off fine then a sound like the supercharger can be heard and it not the supercharger regular sound it constant and annoying buzz and then the rpm goes up quickly when trying to picking up speed and goes down to 30 and then the car won't drive and it start to decrease in speed until pullover then i can drive on the rode. another note is that i let my friend drive my car and he was switching the comfort and speed mode while driving a lot.