You feel like you lost something. Or you missed out on something you could’ve gained. You have a feeling of emptiness, like being hungry and you just dropped your plate of food in the street. How do you get over it fastest?
Do some work. Make a new friend. Send a business inquiry email.
Do something that gives you a feeling of gain, makes you feel you’re adding to your life. This is how the brain works — it can be tricked easily. It’ll work for you — of you work.