Hey hi hello!
I got a potential answer for you.
After ANY thrilling and/or happy experience, it's very possible for your brain to quite literally run out of the proteins and vitamins you need to make more happy chemical. People get dopamine crashes anywhere from a couple hours to a couple weeks after abormal but exciting events - whether it's a really good day, they did a lot of socializing, had a lot of fun hyperfocusing on a project, had an intense sexy time experience, a huge performance they were excited for, a date, a day at a theme part, etc etc etc.
Your brain goes into overdrive coming up with !!!!!!!! chemicals to keep up with your environment, then -especially if that was an abnormal experience or if you don't have the !!!!!! chemicals in excess very often- then you just run out for a while.
You can remedy this by finding other things that will be good, but not expect the !!!!! along with it. Instead of something you really really like doing, find something simple and calm and comforting. Snuggle with a friend and watch a movie, pet a cat, write a letter, etc.
Definitely get some vitamin d, chocolate if you can / like it, and take a multivitamin. Protein is important for regrowth and restocking, so get plenty of that too to bounce back quickly!
Love you much, I hope this passes very soon 🫂