Microsoft Rewards points dropped to zero and Bing history gone

one simple cause for the history part: if Edge was set to clear cookies when it closes, it signs you out of Bing each time and the history looks gone. it's still on the account, you just aren't signed in. sign back in and it comes back.

Both going at once makes me think you're signed into a different Microsoft account than usual, not that anything was deleted. Click the profile icon on Bing and check the email. Happens a lot with Edge picking up a work or school account. If it is the right account, look at the top of the Rewards dashboard. A suspended account shows a notice there and the balance drops to zero. Points also expire if you don't earn or redeem anything for a long stretch (18 months last I looked).