I think at the moment your stuck in a rut and you just can't see your current situation improving. You have lost contact with friends. Your marriage does not sound like it's a happy one. You spent a few years at home due to illness and then having children. You now back working full time but are are still responsible for the kids, housework and all the wife work.
No wonder you feeling stuck and miserable.
Your now back in full time work. Ok it might not be the job of your dreams and perhaps the pay could be better. You have a current job to put on your CV and have possibly gotten other skills/training since starting this job.
Now that your back in full time work and you need to stop doing everything at home as well. That is your biggest problem at the moment because physically and mentally it's to much.
You need to tell your husband that since your now working full time that your no longer able to do all the house work ect. He needs to start doing his share. You need to write down a list of all the jobs needed to run the house ie cleaning jobs, laundry, admin, food shopping, meal planning and cooking, gardening, house maintenance ect and decide who is going to do what.
Put in writing who is going to do each job and what day/evening of the week X job can be done. I would also get a slow cooker and put a meal on in the morning so you have a dinner when you come in. Do some batch cooking, freeze in individual portions and then on the busy evenings you have something to take out of the freezer to heat up stuff like chilli, stews, Shepard's pie ect.
You also need to train your kids to pick up after themselves, put their clothes in the laundry basket, dishes in the dishwasher ect. If they are in primary they are old enough to start learning these life skills and when they get a bit older teach them how to cook.
I have a friend and both her and her husband worked when the kids were small.
They realized that because of kids and working hours it was hard to do it all so they got a cleaner in for a few hours a week once a week. She cleaned the house, did a lot of ironing and put on washing as well. My friend said it made a big difference and was worth the money as it kept the place clean/tidy and they never had a big lot of washing or ironing that needed to be done.
My friend got a great job opportunity about 12 years ago because of her qualifications and work experience up to then. I know as well that she lost contact with friends when they had small babies but as the children got older she got in contact with them and arranged to meet up sometimes with their kids. You need to contact your friends again and arrange to meet up with them without bringing your kids being with you.
I think sorting out that your not doing it all at home would help you feel better. If your husband refuses to pull his weight I would stop doing his laundry, cooking his dinner or sorting things out for him. When he has no clean clothes, meals ect he should get the message that helping you benefits him. I would also get out of the house at least one evening a week to meet up with friends ect and let him mind the kids then. This will give you something to look forward to and build up your friendship's again.
In regards to your job once you get things sorted out in the house things will get easier.
You have not been out of work to long and your already back in the work place which is good. If you want your career to move on I would look at current opertunities where you are and see what you need to move up their. If your current job is just ok, I look to move into a large organisation where you can do more training and get experience to move up jobs wise within a few years. Even if you and your husband had to pay for more childcare or a cleaner once a week long term it will benefit you all financially.
If your husband is not willing to work with you now I would start to make a plan to leave him.
Get all your joint financial details together, copy them and leave them somewhere safe.
Start to put a bit of money aside and work towards getting a better job. It might take a bit of time before your in a position to tell him it over but at least you can see that better days are coming. Also be very careful not to let him know your plans or to get pregnant again.