Homesickness is overcome through learning coping skills and being resourceful, not necessarily by going back home. I speak as an immigrant, btw. I've moved continents twice in my life. My mother has tried twice, and gone back home twice, leaving absolute devastation in her wake - and is now lonely, poor, and reliant on the kindness of family members for basic survival.
When you moved with your dh/dp, you may have relied on him to cope on your behalf, more than you remember, and that might have made it easier on you. Now that you're moving with your kids, I expect you're projecting your childhood feelings onto them and it's all come rushing back. You are probably reexperiencing trauma that you went through when you were 11, and struggling to cope with it along with the normal feelings that come with a house move.
You can learn to cope, really you can. Again, I'm speaking as someone who has moved 1000s of kms, to places that I had literally never been to before, sight unseen, with nothing but a suitcase. I've also divorced and had to move out with my little DC. I cry my eyes out every time I move house, it's awful, sickening - but one just gets on with it, it's part of life.
Your kids need to learn from you here OP, don't put them through their own trauma and then show them a poor example of how to deal with it. Talk to your counsellor about doing an inventory of your coping skills, and start figuring out what you can work on.