Suddenly starving today 22 weeks

Jill • Pregnant with baby 2! Due 12/25/18
Since I've been pregnant I have eaten barely anything and I get full after only a few bites due to morning sickness I didn't have an appetite. Starting at 18 weeks my appetite started to return slightly back to normal but not quit, I still have lots of leftovers. Today for the first time at 22 weeks I am ravenous, I eat and 15
Minutes later I feel like I'm starving. It's actually painful- right now I'm trying to take a nap so that I can forget about this gnawing hunger for alittle while. Anyone else ever experience this?