1995 Acura Integra

Hi I have a problem with transmission im assuming. I brought it to a friend thats a mechanic and he changed the cv axle and did a tune up, changed a belt I dont know which one specifically. I'm not sure if the car jerked while shifting gears prior to fixing it but now when it shifts you can totally feel it jerking like pulling you with it. And im scared that it'll break down soon. Also often now becoming more on occasion, something from the hood is making a squeaky noise and my friend said it was a belt. A lot of times itll make that sound when I press on the gas or I press on the gas then let go. It never did that before it was fixed.