What could be going on?

So it's been 6 days since my period finished and I feel almost the same as I did when I got pregnant last year. I know I can't be pregnant because I had my period recently but I feel bloated in my uterus, have sore-ish/sensitive boobs, mild cramps, feeling sick, getting headaches, being really hungry like I was before I miscarried in January. What could be going on? When my period ends I usually have no pain anywhere at all, no bloating, sore boobs etc