I’m also an ESL teacher and going back to the UK hit hard, especially just the lack of employment prospects there, our experience is worth nothing, it’s basically like starting again from the beginning.
That, and the reverse culture shock hits like a freight train. The boredom, normality of everything and while friends/family will be polite, nobody could give a damn about your overseas experience. I spent many a day looking out the window at the rain and reminiscing riding a motorcycle along a beach in Thailand or eating pizza in Italy and wondering where my life went wrong.
I was on a plane out again within 4 months and have no desire to ever go back to Blighty.
Singapore or KL