Breakups don't feel natural

Vent here we go:

I got out of my first relationship recently and my emotions and how my body is reacting to this feels wrong. It feels like this isn't natural for humans. That breakups weren't made for people. 

Minutes after the breakup the smell and sight of food made me nauseous. I haven't been eating, I weighed myself yesterday and I lost 6 pounds. My chest has been hurting, if I stay still for too long I get this wave anxiety. That's not all my emotions have been weird. I have days where I'm sad, angry, thriving, feeling nothing, etc. I just hope this will end. I miss the times I was single with no experience, yeah I was lonely but I wasn't like what I am now.