I think nearly everyone has been hit with an emotional reaction at sine point or other, and they can come out of the blue or crop up when you didn't expect it based on things you thought would have a different significance.
'Will it really happen this time?' is an unsettling thought in its way. We sort-of know (now) from last summer that transmission outdoors is way lower than indoors, and that bigger groups are likely to be just fine especially in the months when the sun is strongest.
I suppose the worry is that this is another false dawn? Can't quite believe it will all happen until it does? Or that it'll all be reversed again in the autumn? Or perhaps something else, harder to pin down and describe?
Whatever it is, then you might just have to wait until it passes (I went flat a few weeks ago, and found that acknowledging that I was finding it tough that week, for no particular reason other than it being a cold grey time, was in its own weird way helpful. Because it helped me recognise it as a feeling, and look to ways to counter the worrying and negative. Looking for even the tiniest positive thoughts, or things to enjoy helped. Alongside just sticking it out.
It does sound as if you're going in to a challenging time at work, especially if you have to do the unlocking in totally different ways to last time. Do you have nice colleagues?