As many have suspected I do believe that Tesco allowed Jane to shield as her work could not be done from home and her weight would qualify her for BMI reasons.
This will have contributed to the weight gain because as few as JG's hours were she was no longer off her arse, walking and not stuffing her face for a couple of hours a few days a week.
I think she has become so big for her height she will now struggle with the minimal movement her job requires. Charlie will be expected to do absolutely everything.
We know Jane reads here, does Charlie? If so Charlie, what does your wife add to your life? Nothing worth mentioning financially, you are cleaning the flat (if and when it gets done). She heats up a few ready meals and orders hot food to be delivered. I would be surprised if there are even conjugal benefits. You are better on your own than in bad company, go see your mum, stand on your own two feet. Jane won't, she'll move straight back with a parent. You seem very depressed, life can get better.