The ballistics associated with a gun shot wound can cause a whole host of problems in the area right around the tract.
The tingling is from a nerve injury. It is very common for the nerves in the area to be stretched from the injury. Nerves are injured very easily. Usually, they will wake up on their own, but usually within six months. After six months, it is still possible, but not as likely. Unfortunately, there is usually nothing to fix, as the nerve is still in continuity (not cut or torn). But, stretching the nerve can damage it permanently.
The jerking is also usually from a nerve injury. The injury can be to the motor nerve or to the area where the nerve innervates the muscle. If this is a big problem, there are things that can be done. You would need to see a neurologist.
The "swelling" needs an etilogy. Is it swelling, as in inflammation of the tissues? Or an infection? Or is it a fascial hernia, allowing the underlying muscle to bulge through? There are a lot of things that can cause swelling. You would probably need to see an orthopedic surgeon.
Some of this may calm down over the next six months or so, but probably not. But, you can always wait and see. Otherwise, you will need to see the appropriate specialists.