Can liver blows lead to permament damage?

Today was the second time I've been dropped by a liver blow. Shit fucking hurts. Can you get permament liver damage if you receive too many like head concussions? Also, what can you do after receiving one to recover? (Like stretch your body? Breathe? Any good tips?) EDIT: I can still feel tintling after effects in my liver... Is it okay to still do body exercises (abs) or should I take a break?