Best friend moving away :(

I met my best friend a year ago and she’s quickly became one of the most important people in my life. She is the most wonderful human I’ve ever met and our friendship is something I’ll treasure forever. However she decided two days ago that she is moving abroad, forever, and she leaves on Thursday :( I’m a bit of an emotional wreck at the minute with that news coupled with starting birth control AND being on my period. Any one have any advice or went through the same thing? I feel silly for being so upset about it as we’re not kids anymore and change is just a part of life but I clearly don’t cope with loss very well 😂