You should get to see your doctor much sooner. Whilst this severe reaction to the flu shot will probably pass, very occasionally it can have really severe repercussions.
Like Guillain Barre syndrome. It's most unlikely, but the numbness and weakness in your hand is worrying.
If your inability to open bottles is because of pain in the hand, I'd be less concerned. No pain, just numb and weak? See your doctor pronto.
Was is odd is that the numbness if following a classic C6 dermatome, suggestive of a pinched nerve in your neck. Any neck pain?
Go to Search this site …
and type in Upper Limb Tension Test. Is your lower left arm much tighter, tingly, painful during the test than the right arm?
It's vaguely possible, unlikely, that this is quite unrelated to the flu shot. I can't see why the vaccine would affect only the C6 dermatome.
I would suggest you gently exercise the whole arm. Using that Search facillity you can find Frozen Shoulder exercises that would be suitable for the upper arm. You don't want to get a shoulder / arm problem from this shot.
Prick your fingers and arm and compare with the other arm. Look out for specific weakness. The triceps will often be affected by a pinched C6 nerve root. Does your left arm tire very quickly doing press ups?
Good luck, let me know how you get on.
This is known as Iatrogenic illness - doctor caused disease.
There are still many question marks surrounding vaccinations. We think they should only be used for serious diseases like polio. That's just my opinion, but I've had so many patients over the years react very badly to the flu shot. Go from numbness in hand and in thumb and index finger after flu shot to other Chiropractic Conditions often treated…
I hope this has contributed.
Dr. Barrie Lewis