dizzying (AmE), giddy (BrE), mad (esp. BrE)
The next few days were a mad whirl of parties.

social
It's easy to get caught up in the social whirl.

endless
an endless whirl of parties

in a whirl
His mind was in a whirl as he searched frantically for a solution.

Whirl is used with these nouns as the subject:
mind