@Cherie3 this must be very upsetting; I hope you are able to re-secure your account.
Please also check that your personal email account is secure, as sometimes bad people first compromise your email account, and then use that to reset the passwords on many accounts (not just AirBnB).
(Remember: often online services let you reset your password by sending an message to your email inbox. If the person has access to your personal email, then they can reset your passwords on any service where they might know you have an account... which they can sometimes figure out from reading through your email.)
By the way, in addition to saying "My account was hacked" you also say "AIRBNB WAS HACKED".
What indicators did you see that make you believe the entire AirBnB system was hacked?
Was there anything beyond the compromise of your own account?
You say "My assumption is that there are many accounts impacted right now without the hosts knowledge..."
Is that just an assumption (as you state) or have you seen some actual evidence of this?
I hope your mail email account has not been compromised!
And I hope you are able to keep control of all your other accounts!