I am very excited for you OP because discontent is the necessary chrysalis/ driving force/ engine for change!
Without motivation or spark you will go nowhere/ stay static. So this is your opportunity and you need to take action ( posting this is your first step on your new path. Don't let your dh hold you back, disengage from his negatively as if you let him hold you back your resentment with cause you to seethe which will cause ulcers and kill your relationship dead. So just carry on and do not let him influence you as you know you making the most of your life will benefit your DC ( and him if he wants to come along for the ride).
Look into NHS bursaries and choose a profession from the ones which can train and study you for free as you are low income so you will get a full one plus childcare.
Your dh cannot hold you back from relocating and with a full NHS bursary you will be able to move closer to the uni of your choice.
I know plenty of women who are doing just that and universities welcome mature students so please look into your options.
The other area is carework where you have the opportunity to study part time, either way, your local college will have details of courses.
You cannot help your dh but you can, by example, provide a shining beacon of hope to him and your DC by pursuing a much more positive path. Plenty of people initiate new career changes at different stages in their lives, be flexible about where, what and how and don't let anyone hold you back.
It will be the best thing you have ever done. Don't expend any energy fighting your dh over this just go ahead with it and he can either go along with it with good grace and be supportive or he can go along with it and be negative.
Either way do it and good luck and let us know what you choose to do! 