Miaou, I've had a lousy time with MS throughout my pg, now 38+3 and finally all seems to stay down....
My mw explained to me that the reason I needed to eat little and often is that the nausea...and ensuing sickness....is caused by wildly fluctuating sugar levels...and when they start to go out of kilter, its really hard to bring them back within 'normal levels'. So when ms strikes and I feel bad, I have to force something down every 20 minutes .
I'm really not a big fan of snacking, so this was really difficult as you say, the thought of eating was far, far less traumatic than the event itself.
I found dry cream crackers really useful, I kept a little tub next to the bed and would eat one before getting up (DH said it was like sharing a bed with a rabbit!). Also, really helpful were preggie pops - I got them from mothersbliss.com, as long as I had a lollipop in my mouth, I didn't feel sick and these were particularly good at work (hiding behind monitor so no-one could see!) I recommend the sour fruits one but not the variety pack unless you like lavendar and ginger - they were very odd!
Ginger biscuits didn't work for me but ginger beer did for a while. I found sea bands quite effective too, not sure if that was psychological or not, and quite frankly, didn't care as long as I didn't feel sick.
I also found that drinking very cold drinks made me feel worse, which is quite unlike me, but the shock in your tummy can be quite disruptive.
Above all, eat, eat, eat, the longer you leave it between snacks the worse you feel - and the snack doesn't have to be unhealthy, a piece of fruit, half a slice of dry toast, dry cream crackers (promise they're not as bad as they sound) are all as effective as crisps and cake!
Really hope you find something to help make you feel better....and congratulations and good luck with the pregnancy!