OP I've read back through some of your posts and it seems you are crying out for help for what has become a very dysfunctional family.
You have a DH who is obsessively miserly to the penny and a fun sponge.
You have a 15 year old DD who is struggling with severe anxiety and stress over a class and exams. She's been chronically unwell and run down for awhile and possibly with a eating disorder.
You have a 13 year old DS with ASD who is bullied at school. At home he screams and curses everyone making their lives miserable but has no consequences.
There's you trying to peace keep between everyone as most of the time they're at each other. Add to that, you're deeply unhappy in your marriage.
So Yes! you have a lot on you plate. Way too much.
I don't think a message board, or NLP coach is going to solve these problems.
The first thing would to get yourself and your DC into individual therapy asap. You can ask your DH to go but if he won't, he won't.
Whether you stay with him or not, these thing still need to be worked out.
Get your DD to the GP asap. Full workup. She may have anemia or something that is dragging her health down.
There is treatment for anxiety with CBT and medication can be super effective to treat it.
Eventually some family therapy and behaviour coaching would be helpful to learn about problem solving, communication good behaviours, boundaries, etc.