There is no doubt that my T feels a lot worse when my mood is low. When I am happy and bouncing around it goes into the background. When you are low it is like it is waiting there to feed off your negative emotions and drag you lower.
I try to think of my "well-being" as being a bit like a storage tank of good energy. I have to work each day to keep it topped up. Small things like eating well, sleeping well, taking time out from work all keep it going. Supporting a friend or helping others really work for me.
I cycle a lot so that is good for me. Taking a few moments to watch nature really works. Spoiling yourself is a winner on all fronts.
When you have a bad T day and other work stuff happens then I can really feel the tank getting empty very quickly. I usually have enough reserves to get through difficult days but occasionally take a chill pill and have a early night.
My suggestion is that when you feel good then do lots of more good stuff. It will top up your tank and help you get through a bad day. Don't wait until you feel low. By then it's too late and you could be running on empty.
Hope that it works for you.