Thanks for query,
I think your numbness
is more due to anxiety
Local intra mascular injection is usually given at upper outer qudrant of hip to prevent any nerve
& exactly that was given to you.Some times due to unabsorbed drug or collection of blood it may cause swelling leads to numbness of local area or that limb but it will never affect your upper limb or arm or elbow.
the numbness usually resolves by it's own or you may apply thrombolytic ointment.
You should watch for any local swelling or redness
if that happens you should consult your doctor.
Thanks once again.