Menstrual pattern is liable to change due to physical/psychological stress
. May be you had it this time.
The nausea/vomitting & hunger bouts areseen in few patients having early pregnancy
. but since you had period in time,home pregnancy was -ve it's less likely to be pregnancy.The doubt can be overruled by blood HCG testing.
How ever same type of gastric upset is seen in gastritis
with head ache is seen in refractory errors.Please get your eyes checked.