Insulin question?!

Bethanyy • 09/30/15 👧🏼 01/21/19 👼🏻 04/28/20 👶🏻

New to insulin here, only been doing it about a week.

So when I do my insulin, I switch arms and spots(because that’s that it says i dont know why) but when I go back to my left arm, it hurts wayy worse then any other spot and it makes my left hand go numb/tingly?!! I’ve noticed it the last 2 times I’ve done it.

Anyone experience that?