So Sorry to see you here @Amanda_StKilda .... but you are in the right spot for support & info from those who've been there before you.
WOW! What a whirlwind! Scared and anxious is totally normal ... tears, fears - even the odd meltdown - as your brain is in overload just now. A good cry can be quite cathartic, too ....
You don't have to tell 'EVERYBODY' at this point in time if you don't want to as it can all be rather overwhelming, just adding to your anxiety - initially, just your close family & best friends - your workplace boss (if you must.) I told everyone initially by email (cos I knew I would just blub if I tried to talk!) Then I just kept everyone up to date with an email as events unfolded. In the original email, I indicated that I may not get back to all of their replies ....
Take lots of Deep breaths, take one day at a time - keep doing what you love doing to help pass the time (for me that is running my ukulele group & going kayak fishing!) My uke group was such a terrific support for me over the last 12 months (I was diagnosed on Jan 5, 2018.)
All the best for next week - take care xx