What Causes Alternative Hot And Cold Flashes After Hysterectomy ?

hi I'm 50 and female I had a hysterectomy when I was 33 my problem is I been sick for 4 days now I get hot flashes then cold flashes I don't want to eat all I want to do is drink water n sleep I get diariaha I throw up if I try to eat so I don't eat and its taking all my strength to type this I get aches all through my body when I get the cold flashes I start shaking all through my body like its taking over my nervous system and feel crappy all the time