Period question! Need help please!

So I was on birth control from May 2018 to June 2022 (just recently got off it) and for the first 4 months of being off of it BC my period was normal and predictable but all of a sudden it’s stopped coming. I’m on day 64 of my cycle and still no period and it is bothering me so much!

In early NOV I had a week of horrible stress, got sick, and went through a three hour time change the week I was supposed to get my period and so I never ended up getting it. But it’s been 60+ days later and still no period.

I’ve taken countless pregnancy test and they’re all negative. Any help??😭😭🥲