I am sorry you feel like this travelsafar - are you sleeping OK?
These light sunny mornings may be depriving you of a couple of hours’ sleep at a time. Another possibility if you regularly feel totally washed out, might be anaemia. I used to swear by Riboflavin, an iron supplement.
As we get older we do need to pace ourselves. And perhaps you are doing too much.
A day in London (which seems to be at least once a week) can leave me knackered but I do try to do as much as I can - art history and literature classes, Book Group, helping at the Food Bank, TAS (used to be NADFAS) , theatre and cinema for streamed opera and ballet (which works out much cheaper than West End prices+ the fare.)
All of these are tiring but also stimulating and energising.
But I also wonder if you are generally “down”?
Maybe a nice meal out, a trip to a NT house or gardens might perk you up?
Whatever it is, do not beat yourself up about it.
Smell the roses, enjoy sitting on your garden and instead of weeding, think of the borders as a wild flower conservation area!