I've suffered from something very similar, other people have advised getting some exercise and you should definitely do that, I've found it helps.
You mention that you don't sleep very much and tried to sleep more for a few nights, try to continue that for a couple of weeks and see how you feel.
Something that often isn't mentioned with respect to sleep is consistency, go to bed at the same time and get up at the same time, every day - even on weekends. I personally struggle a lot with this one, but it has helped me a lot when I adhere to it. Even when I don't manage to go to bed at the same time on the weekend, I make sure I'm at most an hour late.
Another possible reason why there may be no differences in the UK is that some councils here offer free access to swimming facilities. A council I used to live under provided free access for everyone, then budget cuts happened and I think it's now limited to under 16's.
It's not being tolerant of intolerance to consider his views on an entirely disparate topic. If his views on LGBTQ people were being discussed, then yes they are repellant and I would say so, but they have nothing to do with the topic at hand.
Judging all of someone's views as wrong because some of their views are wrong is foolish.
As for the article itself, I found it to be overly stereotypical and lacking in actual insight.
You mention that you don't sleep very much and tried to sleep more for a few nights, try to continue that for a couple of weeks and see how you feel.
Something that often isn't mentioned with respect to sleep is consistency, go to bed at the same time and get up at the same time, every day - even on weekends. I personally struggle a lot with this one, but it has helped me a lot when I adhere to it. Even when I don't manage to go to bed at the same time on the weekend, I make sure I'm at most an hour late.
Good luck!