Nauseous after breakup help

My boyfriend and I of 3 years broke up a few days ago, and the morning of I threw up. I’m not someone who gets anxiety that makes them throw up, and I’ve never thrown up before unless I’ve made myself because I was too drunk or because I was sick. Anyways, I’ve been nauseous since then. Sometimes I really miss him and I can feel it in my heart and all that and I get very sad, but I feel fine right now and I’m still very nauseous. And it’s not like I think about him and it gets worse, it’s like solid nausea all day and gets way worse after I eat. Has anyone experienced this? Is this from the breakup but I can’t control it somehow?? Like I promise I’m doing fine but I really just can’t handle eating anything I’ve already lost 6 pounds. How can I help this???