My grandparents were both Scottish, both emigrated to Canada in the 1920s, she with her entire family, he with his brother and cousins, all of whom didn't stay long. They got married, had a family, then my grandfather decided he wanted to go back to Scotland. In terms of timing it was awful. 1937. They were in Scotland for the war, in a house with no running water, sharing a tap with other families. They sent their eldest daughter back over to Canada with a visiting cousin because she was having a nervous breakdown and the plan was for them all to save up and go back but of course they couldnt because of the war.
People in the town used to say my gran could have swum back to Canada with all the tears she shed. She was from a completely different part of Scotland too.
My mum's brother and sister emigrated back to Canada after the war but my mum stayed with her parents so the family was well and truly split.
I wouldn't wish this on anyone. My mother and my grandmother were both very unhappy women and my grandfather never properly settled back in Scotland. When they retired my grandparents visited Canada every year. My grandfather learned for it but was never happy when he was there, but he wasn't that happy at home either.
Both my aunts had no problems moving back to Canada but my uncle yearned his whole life for Scotland.
Anyway, what I'm saying is that it's complicated. You can never get back what you left and you can't go back to how it was. Anything you do will have repercussions. Life in the UK won't be as brilliant as you think.
But your feelings are very normal. Therapy might be a good idea xx