Welcome Doreen!
I moved over in 1998 and I was just turning 43. I married my Brit that year and he's the same age as I.
You've gotten great advice about keeping an open mind...I just wanted to share one additional thing that I went through:
I always prided myself for being sharp and clear-headed, great memory, always knew where everything was at anytime, etc. My sense of direction was great. I felt very balanced and in tune with everything.
Until I moved over here.
Don't know if it's the driving-on-the-other-side bit, or if my magnetic north skewed in such a way that I lost my sense of balance, or if everything was so -- just-so -- slightly different that I felt I was being subtley Gaslighted. 1
Whatever it was, I felt like my bridegroom was getting less of the person he'd fallen in love with the minute I set foot on terra firma here in the UK. It took me a year to regain my sense of right and left. After almost six years I am gaining the recall of which way a light turns on/off, which side to flush the toilet from, etc. I'm also able to understand the vernacular better and "think British" now to some extent. I am still, however, completely whacked when it comes to directions.
What price this? Well, I don't always recall the US word for something. It seems that to fit all this new stuff in my head, a lot of the old stuff had to be taken out. I find myself being overwhelmed by the US now. Too many choices. Too many bright lights and too many signs. A lot of advertisements with people in your face wanting you to buy their cleaning product or ask your doctor about their prescription.
But for all this, I treasure the experience. Oh, I'm still learning, but I bet I remain younger for longer with all these mental gymnastics.
And I think now my husband is starting to get the person I once was. Not totally, but I'm not so scattered anymore. But it's going to take a few more years to reorganize myself.
1 "Gaslight" is a film about a man who intentionally does subtle things to make his wife feel as though she is going slowly mad.