My camera fell while on the tripod and the lens fell off completely while the camera body remained on the tripod so when I reattached the lens it wouldn't stay it works and everything but I just have to hold it together. Should I try to take it to a camera shop or just send the lens back to Nikon so I can get a new one ?
There may be a problem with the lens, but it is more likely that the lens mount on the body has been damaged. You need to have either a local camera shop or a Nikon service center look at both the lens and the camera body.
Some things that will affect your decision:
If you know anyone else with some Nikon gear, try using a different lens and another camera body with your camera and lens to see which component is the source of the problem.