Welcome to beyond Blue and well done for reaching out.
I would like to suggest, that if you haven't already, you could perhaps go and see your doctor. There could be something in your diet that does not agree with you? Like a food intolerance, for example. I know that when I have dairy products, I feel sick afterwards. And the more dairy I have, the worse the nausea is, to the point where, yes, I could quite easily vomit.
Other than that though, I don't really know what else to suggest?
In the meantime, you are welcome to come here as much as you like. I do hope you get some answers soon. Take care. I'll be thinking of you. xo