I just found your thread. Is it ok if I come and try to support you as well as the wonderful people you have supporting you.
I can relate to you not coping with the heat, I'm exactly the same, I shut blinds doors etc, but I read somewhere that we need at least 15 minutes of sunlight per day, which does something to our chemicals which helps us for sleeping.
Elizabeth, have you tried internet jigsaw puzzles, Alphabetty, scrabble, solitaire on your phone or ipad. I do these when I'm not to sad or in to deep, because they are mind changing games, you need to have your mind completely on these games to play. The brain can only think one thought at a time, so when playing these games your mind is totally involved in the game. Just a thought.
The swim in the lake sounds really refreshing, I'm pleased you felt better after the swim. I haven't had a swim in so long, I might have forgotten how to swim.
Sleeping for me is hard at the moment, I usually meditate first, then put on soft music with luck I fall asleep during the music. There are a few apps for meditation, I use mostly, insight timer, I like it and the music switches itself when finished.