Sounds like there's a lot going on here that needs some adjustment - the question is whether your relationship with your DH is strong/stable enough to tolerate those kinds of adjustments, and whether you both have the communication skills necessary to be able to figure this out without a massive amount of resentment and upset.
The easiest aspect to any problem is to focus on what you can control: Why don't you drive? Do you have a driving license? If not, what is stopping you from getting one? Barring medical issues it seems like one of the best things you could do for your self and your own benefit would be to get yourself a driving license and then stop being so reliant on bus routes. If you are worried about manual driving then take automatic lessons and drive an auto until your confidence is at a higher level and you can take an auto-lesson.
If you lack the confidence to drive then ask yourself why? This is something that, again, you can resolve yourself - there are lots of therapy and CBT options that can help with anxiety and self belief. Lots of driving schools also have instructors who work with people who are older and have had difficulty passing the test in the past.
Think of the amount of time and money you are spending on buses, and the amount of stress this is causing? It's also likely impacting your children because they are reliant on buses too.
If you just want to be more mobile yourself then why not take a motorbike license lesson and test?? Even a scooter would open up more options for you and give you a greater degree of independence.
On the husband front: hopefully you have the communication and stability in your relationship that allows you to sit and have a measured and reasonable conversation with your husband in which you not only convey your need for him to pick up his share of the child raising/ferrying/feeding etc etc work, but also be sure that when raising problems you also provide potential solutions to those problems. His response is likely to be that he is working full time and that when you had kids you had a conversation in which you conveyed your preference that you do child raising (or that you did not voice any concerns at the time etc etc). If his schedule truly is flexible then present him with a schedule that you've worked out that makes things more even in terms of child care duties, and ask him for his input.
As for your work situation: If you cannot drive and there is no way for you to change that situation then you are indeed reliant on buses. As an initial matter you can/should try to get a job that allows you to work from home. It also sounds like you may benefit from trying to figure out ways to be self-employed. What skills do you have?? Are any of them suited to a self-employed job?? If not, what skills would you need to learn so you could be self-employed?? There are loads of jobs out there at the moment - the question is whether you have the stomach for some of them. In terms of minimum wage/lower paid jobs: there are LOADS of carer jobs out there - and many of them have adjustable hours and can be extremely flexible. They are crying out for those kinds of workers at the moment, which means you would have far more ability to set your hours and expectations. Identify whether there are care homes near you and go from there. If you don't want to do care work or similar then what skills do you have and what do you want to do?? Most schools need teaching assistants: those are school hour and term time specific and require next to no skills whatsoever other than a clean DBS check and base level GSCE grades. If, for some reason, you don't have those GSCE or equivalent grades then it would be definitely worth your while to get those grades.
Good luck - try to work on other stuff that you have in your control: A positive mental attitude, communication skills, being a problem solver and coming up with solutions rather than just problems, and presenting yourself as someone who is great to work with rather than someone who is negative/difficult to work with etc etc. If you struggle with any of those things there are lots of resources online that can help you, and books etc at the local library.