When accelerating it feels like one of my tires are wobbling and about to fall off

I have checked all of them along with the lug nuts and everything is tight. I feel a constant vibration under the floorboard and my seat is shaking somewhat as well. Also, when I hit a bump there is a hard bang in the front end. I just bought the car less than three months ago and it ran perfect for the first month and a half. Now it feels like the front end is going to fall apart. Please help me diagnose this. I don't have a bunch of money to just start replacing parts hoping to find the solution. Thanks