I would be worried, I mean I still feel super nasty sometimes, and even if I cough to hard it can make me get sick, but I am still able to keep food down. I would worry a little cause your baby needs the groceries more now than ever. Try taking gravel to settle your tummy and eat a good nutritous meal yes it is safe. I also suck on ginger candies cause they are great for settle upset stomaches and it could just absord through your mouth and not really go much into your stomache, the health food store should have them. Other than that just try to eat what you can and see if your OB would perscribe you some stuff for MS, cause you don't want to dehydrate yourself or baby.
Like I've said before, that's what the placenta is for. It will supply the baby with the nutrients it needs. We as a human race are not that fragile.
But OP, there are lots of meds and remedies for stuff like this. Have u looked into it??
There are also women who go through their entire pregnancies throwing up every single day. It does happen. You just need to find a way or something to help you through it