fluctuating birthday mood, anyone here feeling this way too?

idk last week was really looking forward to my birthday, i have my vision board, already bought cute stuff, but all of a sudden over the course of this week my mood just dropped. for no other reason??? people around me, who usually ruin my mood, are well-behaved. but then my thoughts suddenly go woop the reality is so sad how people are the most amazing beings on earth but also the most horrible. i hope i feel better next week because i don't want to spoil all the effort i put through uplifiting my spirits. maybe it's just the rain or the book i've been recently reading or idk the extra workload my boss gave me, but yeah i was hoping nothing would make me feel so down :/