yes trial and error OP buy small quantities of anything that you think you might like. because once you eat it you may decide bugger I hate this .
ive had it all pregnancy I'm due early may still got it but not as bad, I do make noises like throwing up and get severe heartburn in my throat if I don't eat regular.When I mean regular I mean every 30 mins to 1 hr just nibbles
cereal is always good less milk or lots experiment.
ditch tea and coffee that makes you feel more sick. maybe stick to 1 cup if you really need it in the morning. try mint tea actually really tastier than I thought, I first thght eugh that's toothpaste, but I actually like it! try it with no milk. or a glass of hot chocolate instead of caffine drinks.
cold milk keeps sickness at bay, although for me it stopped helping with heartburn after a few months. if you hate milk add bit of strawberry nesquick powder should taste better.
toast is good, let it cool have it crunchy even better! I hope you don't have heartburn too coz it restricts you further.
salted tortilla chips cheap brand coz theyre thinner and crunchier, no cheese just on their own taste amazing
starchy foods like potato mashed or baked with nothing but cheese or maybe tuna if it doesn't stink,it was like heaven to me lol but after a few month cheese gave me heartburn, dreaded heartburn is worse than nausea.
salted ritz or similar biscuits
my fave item in first few months: BOILED SWEETS. if you've eaten can't eat no more and still feel nausea suck on a boiled sweet. boiled strawberry custards, cola cubes, anything boiled that wont make the underside of your mouth sore, stay clear of pear drops theyre too rough lol. Be careful though you don't want diabetes don't finish a packet in one day
water flavoured with something you like I used blackcurrant really weak though. orange gave me heartburn
good luck you can speak to your midwife too, but mine gave me nothing. I guess if I was throwing up she would have I don't know.
after all this there may be many nights you go bed early just to avoid feeling the nausea or heartburn I did this a lot turned in at 9pm just to feel at ease it can drive you nuts I know.
Good luck OP hang in there it will reduce ina few months or if youre fortunate go away completely.