Breastfeeding moms- help.

I don't know how normal this is or if anyone else is experiencing this. However, my son has started this need to start grabbing anything that he can with the arm that is free, when we are nursing. It's almost always my face. He pinches my lip, if I'm sleep and nursing then he grabs my teeth and pulls. He grabs my nose etc. If it's not my face then he's pinching my boobs and it's so hard that he's leaving marks. I'm not sure what to do at this point. I've tried holding his hand or swaddling the one arm down. Nothing is working to keep that little hand away.