Seriously, parasites are the least of your problems at this point.
It's good that you don't have blockage. Next step. Go see a doctor. This is not a small problem. Finding out WHY you're throwing up feces and fixing the problem while you can is paramount and then you can worry about parasites.
Or maybe it's not really feces you're throwing up?
I'm not trying to be pushy but this is too serious to ignore.