It was definitely a lot of both. I lived in a very non white area of Mexico, so I had to acclimate or live a boring life. Also, being the official state gringo meant I met lots,of people who were interested in me. Even though I was well regarded in the community and had adapted to the culture I was still pretty much an outsider. That I think led me to put unreasonable expectations on my re-immersion in the US. But when I got back, over 3 years had gone by and most things were different than they had been. I made the mistake of trying to jump directly back into US life instead of going on a long vacation or something. Time was moving faster in my head than it was in life and I felt that personal and societal expectations were falling short, even though I was doing extremely well according to people around me. Basically, I needed to take a minute and slow things down.
But yeah, things are better now. Slowly but surely I'm getting used to the US again.