Pain in my right buttock, pain goes down my leg

Hello! I have severe pain in my right buttock, and the pain goes down the back of my leg. There's sometimes when the pain is so unbearable, which causes me not to be able to walk. I take ibuprofen for the pain and I use an ice pack, it helps but not for long. I had gotten hit by car back in 2021. Me, my son, and my daughter in law were moving to California cause my son is in the military we drove of course. When went go into Houston Texas , a car hit us which caused us to wreck and the car ended up in the median. We were fine until the cop had my son and I go to our wrecked car that was still in the median to get our license. We walked to the car and as we started walking back towards the officer a car hydroplaned on the interstate and hit my son in the leg and then hit me and it through me 10 feet. My son thought I was dead. My head was split wide open and my right knee was split open as well . I was already having trouble with my buttock pain before the accident but now it's a whole lot worse.