Apple Watch won't turn on after three weeks without use
I was away for three weeks without my Apple Watch. Before I left I charged it fully and powered it off. However, since I got back the watch won't turn on. There seems to be an image of the charging cable on the screen with a green lightning bolt that turns red once the charger is disconnected. If I hold down both buttons at the same time the image of the charging cable pops up and then the screen goes black again. It's now been charging for over 24 hours so it's certainly not just dead. Could someone perhaps tell me what is wrong or what I should do next? It was working flawlessly before I left and I'm lost without it!
Apple Watch, watchOS 4.2