I do not have any homeschooling experience at all and in fact just posted my own freak out post! But you are a mom, you know your kids better than anyone! If what you are doing is not working, not making you or your kids happy, then it seems to me the trash is where it belongs! Once you find something you like, that you think that your kids will enjoy and you start more formally instructing them again, it will be a whole new world!!!! School won't be a moment for dread but something to celebrate and to remind yourself why you started down this path in the first place! Life is learning, you do not stop just because you do not have a formal text in front of you. Imagine the joy in your home when everyone is happier through the day and give yourself time and space to find what will be best....
I hope it all works out for you and your kids!