I think taking retirement - or trying for a sabbattical year, why not? - is probably the best thing you can do. You need time to look after yourself for a while, slow your pace down and do the things you really want to do. You are the most important person in your life, and a very important person to others too, so you need to get yourself right.
I used to come out of every winter in a dark and depressed mood - I have a joke with my doctor about bursting into tears all over him every February :lol: :lol: :lol: . Since I've been taking Vitamin D supplements, and have got my thyroxine up to a dose I feel comfortable with, those horrid 'winter blues' are pretty much a thing of the past. I take a high dose of Vitamin D3, well above the RDA, so do a bit of research on it on Google before you start. I also make sure I get plenty of sunshine, from about now, really - sitting in a sheltered corner in a short-sleeved shirt, if it's warm enough :shock:
Incidentally, all my thyroid readings have always fallen within the 'normal' range, but I had lots of symptoms including dry skin, hair loss, depression, lack of energy, obesity, aching joints and muscles - I could go on - and have been very much better since I persuaded my doctor to treat the person not the numbers. Just a thought!
As for the diabetes - I'm lucky to have been diagnosed early, and am managing it with a low-carb diet and Metformin, to help me lose weight. I have absolutely no intention of getting any complications whatsoever, if it's humanly possible. It has almost given me a new interest in life - it's a challenge!
I too find I haven't the stamina I used to have, and can't do things as easily as I used to, but I'm afraid part of that is getting older :roll: . I retired last April, because I'm going to spend the rest of my life pleasing myself instead of being at an employer's beck-and-call. I still do a bit of consultancy work, which adds a few pennies to the kitty - and you could always look at going back part-time, or tutoring, when you are feeling better.
Do PM me if you want to have a good moan at someone - it does help! You have friends on here who'll support you, and who do understand what you're going through!
We'll all be better for a bit of sunshine!
Viv