This may sound ridiculous so apologies in advance but, at 48 I don't really know the best way to start to make changes.
I've always let my mood and avoidance dictate my days, so obviously that means my mood stays very low and I avoid everything.
Sometimes the idea of going for a walk makes me feel sick, eating more fruit and veg etc.
I just eat frozen convenience foods, biscuits etc as I find it less of a chore to prepare etc.
I'm starting to feel like it's now or never to make a few changes but that mood/hiding/cowardly side is the only thing I've ever known and it's hold over me seems to be total.
I'm very stressed and I just want to.....you know. (Trying not to say it)
It's not ridiculous, and there's no apologies required. When I went through a bit of therapy my counsellor would regularly ask me 'how I'd eat an elephant', they were driving at a point where I'd break an issue down and deal with it a bit at a time. (One fork full at a time).
This served to highlight patience. It had taken a long time for me to get into the mither I had, and expecting a hey-presto instant change was foolish on my part. I had to change the smaller easier bits of behaviours that I could first and then move onto some of the deeper more difficult stuff. Investing this time and making slow improvements can and does add up.
When the idea of something, like in the case you mention 'going for a walk' knocks you sick, that is the most important time to do it anyway. When you let your feeling of dread dictate that you don't bother, it feeds another feeling which is guilt. Now you're dealing with more negativity.
Winters can be difficult, we don't see enough natural light, SADS is a real thing (seasonal affective disorder syndrome) and as we age we become less efficient at producing vitamin D. A vitamin D supplement might be helpful. It's part of my top up stuff alongside cod liver oil.
We all behave different under stress, it might be worth getting a message to your doctor to see if you can get on the waiting list for some counselling. Talking through stress, causes and triggers, and learning some coping methods is definitely something to reach out for.
Believe me, if you're hiding in booze, it aint no good and only makes things worse.
Clean the bathroom, gut the kitchen, weed the drive, put a wash through the washer. Do something that is a small victory for today where something positive has been achieved. We can't climb Everest everyday, but we can climb out of bed and do something for a bit of benefit.