Easier said than done, but you really shouldn’t sweat yesterday – it already happened. It’s done. The same goes for tomorrow. Sure, you have a bit more say in what “could” happen, but spending too much time obsessing over it quickly becomes counter productive. Try focusing on today and/or the immediate moment. You’ve got a ton of control over how that goes and doing so gives you somewhere around 132% better chance of not driving yourself up a wall by worrying.
Worrying = Waste of time, energy, resources and ability. Plus, it sucks and you’re smarter than that.