What Could Cause Nausea And Bloated Stomach After Heavy Menstrual Bleeding?

ok my period, for the past year have started on the 28 of the current month and end the 4 of the next month, in november's end my period didnt come on and i was feeling very nausous but couldnt throw up, i had a huge appettite, and a strong sense of smell, well i started bleeing the 20th of december like i was having a period for 7 days, i dont feel that sick any more but some things do make me nasous, i dont know whats going on and my stomach feels wired and bloated still.