Haven't been feeling my best

So recently i went through a bad breakup and now my ex keeps showing up to my job, i haven't been there when he comes but im not sure what to do if he comes there while im there.

Im glad that we are over and was feeling happy but lately i've had no desire to do much and haven't had much of an appetite. When i do force myself to eat i feel nauseous after. It may just be anxiety. I have been out with my friends and have been enjoying myself but these last few days of hearing how my ex keeps showing up has gotten to me.