Yup, you're definitely not alone.
I was like this nearly my entire pregnancy. Worst in the first TRI, because if i didn't eat even though i wasn't hungry my MS got worse.
Maybe try an add a supplement like Sustagen into your diet. It's just a thick (horribly textured - make sure you use a bamix or a blender to get the lumps out... or melt in boiling water first) chocolate powder you mix with milk (or water but i never tried that) that's full of nutrients, will filly you up a bit and provide a bit more for bubs. I used it a lot until i was about 26 weeks and i got force fed :P