Hacking?
im
worried my phone maybe hacked it started last night with so many alerts in my calendar.
Your phone is not hacked. The calendar messages are a result of you accepting an offer from an app or web site to “allow notifications”.
If running iOS 13, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account.
If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account.