Hi Roamingbee,
I'd say that there's much less of a divide between the US and UK in that life is 'less stressful' in the UK and it's 'healthier due to walking everywhere' ! it's also potentially possible that the NHS doesn't cover a particular ailment/disease/condition/medicine too - too many people think the NHS covers 'everything'... it doesn't, so you could still face multiple thousands of pounds of a bill.
Chocolate.. well I live 2 miles from the Mars factory and growing up the amount of chocolate we had was astounding due to family members who worked there! I like the USA's Ghiradelli' chocolate, but Hershey's.. nope.
For the initial part of your response, keep in mind that 'stress' levels in many jobs and industry sectors is high, just like the US. Given the cost of living is higher in the UK and the standard of living is lower as compared to the USA, there's a lot more people feeling the effects of stress than I think you'd initially think. Just a few weeks ago, a particular statistic which made for horrific/alarming analysis is that around 16 million people in the UK have less than £100 to their name. This mainly means after monthly mandatory expenses have been covered and is among those who are employed. That makes up a massive part of the UK's workforce who are now known as 'JAMs' - Just About Managing. I'd suggest that stress levels amongst them is very high indeed. As for walking everywhere, that's not true by a long shot! After the USA, it's Scotland that has the most obese/overweight people per capita in the world! The rest of the UK and as a whole is very 'exercise' avoiding to the extent there's movements created into trying to educate young 4 year old and up kids to go out an run and play more and look to healthier foods - i.e tackling the problem at the grass roots level. The car is also 'king' in the UK, with most households having one and then driving everywhere.
I'd suggest, if you've not already done so to look at the Visa's section on this site to see how you could use your job/experience to move to the UK. It's very difficult to do so and even at better times of those moving here for/through work, it was for those with plenty of experience in a specialist skill/job or industry sector. I currently 'suspect' that if you are recent college graduates, you'll not have enough experience to meet the criteria to move over soon'ish. I do say that without of course knowing what your job is etc and that your husband may well already be a UK citizen. If that's the case, then maybe the move would be much easier
Given the turmoil over Brexit, the jobs market, the overall economic outlook being uncertain for the next 2,5=10+ years potentially, do ensure you evaluate fully before making a decision to move here given what you'd both like from your lives together.
Cheers, DtM! West London & Slough UK!