Feel awful

Im 39 weeks i know im not meant to feel good. This is awful though and i dont know what to do. Im so tired i literally cant go downstairs to make breakfast but i need to eat. I feel all fizzy and my head hurts so bad. My body feels like its lost all steam and i just dont wanna get out of bed. I havent had this before and idk if i should text my midwife. My iron is borderline and ive had b12 shots so im concerned it could eb that but of course im also terrified of pre eclampsia becuase who isnt. I just feel awful and dont know what to do