I really don't think you should force yourself to like it, it just makes the resentment build over time until its death by a thousand paper cuts.
DH moved to be with me in Russia and hated it, struggled with the language, the culture, the people and he was welcomed into my circle of friends and got a job he loved, so by rights that should have made it easier. After a couple of years he just couldn't cope anymore, he was very depressed despite really trying to enjoy life there. It was just square peg, round hole.
I had been previously offered a job in the US and turned it down, but the company upped their offer so we took it. I have met lots and lots of people who've moved countries, if you've given it a fair shot, and it sounds like you have, it is very rare for it to get any better. It is soul destroying living somewhere you don't like, it eats away at you.
France, ahh so yes quite a difference weather wise. Is there a reason your OH isn't making the effort to visit your parents? Have you tried living in France as a couple? Seems only reasonable for him to give it a try for a couple of years if you've tried Sweden. Do you still have a French accent?
Just wondering as my dubious source of information on Swedish people (my xenophobic Finnish mentee) said the only way it would be worse for me in Sweden was if I was French, and that was quite a common joke amongst my Swedish colleagues... "Ahh you're Russian? At least you're not French." 