Dizzy and nausea

Hi all, I'm 6+6 and constantly wake with headache, feeling dizzy and nauseous. The dizziness subsides throughout the day but the nausea continues. Many episodes of heaving but never sick; also accompanied with much belching! Eating little and often (ginger nut biscuits and plain foods). Tried rennie but chalky texture makes me gag and the smell of peppermint tea is repulsive! Any other suggestions? Many thanks