Advice on stopping nausea

Suddenly started feeling nauseous tonight. I keep feeling like I’m going to throw up and then don’t. Every time after that feeling I feel like I could eat. Given that I feel sick I’ve been snacking on dry food (plain cookies/biscuits etc.). But I eat something and then the cycle repeats itself.

It’s probably stress. My boyfriend well ex, broke up with me last Wednesday and I’ve been finding it really hard.

Anyone have any advice on how to stop the nausea so I can sleep?

Thanks in advance