Keep your chin up mate and keep posting some good memories with the boys. You'll see them soon enough i'm sure.
Failing that, watch some SAFC stuff on You Tube - that usually lifts my spirits.
Pre-covid I was working up in Edinburgh 3 days a week so I'd say goodnight to the kids on Monday night then see them again Thursday tea time. Those 2 nights away were a killer - as much as you think about having your own space and time/freedom to do your own thing it was actually a bit of a void in my day to day
Of course, now the eldest is 16 he's barely in the house and when he DOES come home it's for food or sleep only