I had hyperemesis with DD and am very nauseated/no appetite with this pregnancy and a few dry heaves but no vomiting (yet?) I made a bunch of health changes in the time between my pregnancies so I don't know if it was those things (mostly eliminating foods I'm allergic/sensitive to) that have helped or just that it is a different pregnancy with different symptoms. But things that I am doing this time that seem to help on any particular day are:
force-feeding myself small amounts of protein on a regular basis
avoiding lots of refined carbs (which seem to trigger reflux which can exacerbate nausea) which is fine with me because eating high carb food, except the occasional fruit, doesn't even sound good to me
I take 100 mg Vitamin B6 in the morning (there have been multiple studies showing the safety of Vitamin B6 in varying quantity/doses during pregnancy)
I keep a small amount of high protein food by my bed and if I am awake in the middle of the night I try and eat it otherwise I eat it first thing in the morning before getting out of bed
Sleep on or rest on my right side after eating (it helps the stomach empty)
I'm going to give pregnancy/nausea-specific acupuncture a shot (or a poke, ha ha) this week, we'll see!
I take my prenatal with food in the evening--an empty stomach is a recipe for disaster!
I get to sleep early enough (staying up too late or getting up to early makes me really nauseated)
I turn on the hood/vent of my stove whenever cooking anything (or when feeding the cats their stinky wet food) because smells really set me off. I've also kept a roll-on stick of peppermint oil handy when out and about to sniff for relief.
I take a quart-sized zip-top bag with me (usually in a sealable tupperware container in the car) *just in case* because when the feeling strikes, there isn't always time to get to a bathroom!
I know it sounds goofy, but when the heaves start, I've told myself with very strong mental suggestions "I do not need to puke to have a healthy pregnancy", taken slow deep breathes, and calmed things down. I would have laughed had I told myself to do this last time and perhaps it wouldn't have worked then.
Also, I avoid sitting in the backseat of cars ;-)
I hope you find some relief soon!