Possible anxiety?

So recently I went to a party ( a guy who I have a crush on) at the party, I only knew a few people and one of the people that I knew was a guy who I went on sorta a date with ( he fingered me and I gave him a hand Job after the date) at the party I felt really unwell, to the point where I was physically sick, I feel as though it was to do with the guy I went on a date with because I saw him getting with another girl. Was the reason I was sick Because Of anxiety or just something else?