About my stomach

I had my gallbladder take out in may and for the last four days I've been sick to my stomach and I thrower up a lot today but when I did I noticed I had onions in it the last time I ate onions was fathers day what do u think it could be?

We can't diagnose online. Best to discuss this with your doctor if you're concerned.

Having your gallbladder out could be completely unrelated. It could just be a stomach flu, but you should be consulting your doctor to ensure that you've not developed any sensitivities.