First, you should see a doctor. Especially at your level, you don't want to be at 1,000 feet (300 meters) when you find out you can longer use your left hand to fly and flare your parachute. All of us (including me) may have anecdotes and some experiences, but no one can diagnose you over the Internet.
About ten years ago, I was doing ten-way and had a bit of a collision with someone on exit. It was later theorized that I sustained a brachial plexus injury to the C8-T1 nerves during that collision. The dive went fine but, when I went to flare my canopy on final, my right arm suddenly had no strength, and I ended up having a hard landing because I was unable to finish my flare. I had about 300 jumps at the time and sustained no more than bruises. But I was still able to flare about halfway, so it could have been worse.
But really, see a doctor before you jump. Having the use of your arms is very important.