6 weeks pregnant and cant eat anything?

Ive been diagnosed with hyperemesis gravidarum which when you eat you cant stomach anything, ive eaten a few things this past week but not the usual ammount i usually eat i feel drained and sick all the time, i have been given dissolvable nausea tablets but since my taste has been hightened due to symptoms i can taste the tablet and it makes me throw up straight away, i dont like toast and never have, dont like cereal or biscuits, im also lactose intolorent and hate soya so ive been drinking caffene free tea with lacto-free milk. I find sleeping on my back makes me feel worse so i have to sleep on my side. Any tips that woulf be great