Hit an SUV going about 20 MPH damaged my front right and now having some issues?

After the accident it drove and ran fine. Then about 1-2 days later the check engine light came on. It also started making a really loud knocking sound very soon after I start it and while I'm driving it at low speeds or in stop and go traffic, also it will act like it gets stuck in gear and over revving. On the highway and freeway, it runs normally most of the time. Also, when it's in "battery mode" aka not pulling gas then it starts and is still silent and runs normal. Also, even with a new bulb neither the high beam or low beam will work on that right side the actual headlight assembly wasn't damaged, but the blinker still is working. It did push my frame back a little bit on that right side so I can't open my passenger door more than about 6 or so inches. No leaks and none of the fluids are low. The A/C still works fine.