My heart breaks for you, it really does.
I echo pp who suggested DBT. You really are entitled to help on the NHS, maybe you could look into that as a backup?
My experience (not personal) is the Lamotrogine is a godsend but the anxiety needs to be managed too - does the sertraline help? Or does it make you numb?
You must have huge lethargy, on top of your chronic fatigue. It's a horrible cycle and it's so hard to break.
The rollercoaster of emotions hour to hour is exhausting, as it the mask wearing.
A key for us was to simplify, strip back. Take the pressure off.
I know that's hard with kids, but the less you have to think about (going places, making big plans).
And take real pride in any achievement, just getting up, getting ready and eating breakfast (any of those things) is a win. Don't be hard on yourself. You have an illness, you are not in control of it.
I know it's really, really hard not to grab the quick rushes but try to swap one or 2. Maybe dark chocolate for milk. Toast instead of crisps? It's not easy but I know it all helps.
Keep talking on here, you are NOT alone and you are important.