Period Depression

I have just freshly turned 18, and am still in high school but one thing I absolutely cannot fathom is this random period depression I've been experiencing. (Or so I think it's partially to blame on my period.)

A little context - I'm on day 5 now and it's slowly settling down but these past 4 days have been hell. Its Thursday now and I only have had the energy to go to school on Tuesday for half the day (morning), Wednesday for half of the day (morning) and today, I just couldn't at all.

On Wednesday I left my class half way through after hysterically bawling my eyes out (embarrassing, I know) and cried for essentially most of the day after that point but I just couldn't seem to figure out exactly why. Nothing bad happened, school is going fine, and I'm doing well but this overwhelming sense of impending doom has just washed over me for the past couple days and I can only think of it to be my damn period.

I couldn't get out of bed, couldn't eat, couldn't sleep, and every time I try to do one of those things I just start crying my eyes out. - I've never been like this before on my period and it's concerning because it made me feel so small and so helpless.

Can anyone else relate? Thanks girls.