Without an exam, that can not be said.
The fact that it is getting somewhat better is a good sign, but not in all cases.
Some injuries, particularly disc injuries, can heal while leaving structural problems in place.
Then, years later, more severe problems lead to surgery.
I have seen this happen numerous times.
No one here will recommend that you don't have this checked out, as the site does not replace a doctors visit.
Swelling is not a normal finding for simple muscle strain.
Numbness is definitely not normal, and implies radiculopathy and possible nerve damage.
I take it you have had no exam, no imaging, etc?