It could just be mad hormones, Cami. Due to a problem, I had to take hormones last year and my body changed a lot. I had bloating, sore boobs, nausea, and most definitely felt different. I'd never realised how strong hormones could be befor I experienced that.
Perhaps your body is trying to get its hormones back in whack after coming off the pill? It could overcompensate and make some hormones too high while it's getting itself sorted, and that would give you these symptoms.
Leave it a little while then request another blood test just to be sure.