Hi Mummytummy. Sounds like something you need to pray about. Sometimes we need to stay in difficult situations to lead by example. And then of course, sometimes it is God's way of moving us out of our comfort zone and onto the next wonderful thing he has in store for us.
Having said that, your church should encourage and lift you up. This one sounds like it is draining you. Don't feel guilty if you do change churches - you need to do what God is telling you to do. Personally, I would not stay in a church where the vicar presumed to know more about my relationship with God than I did. I know what God tells me, the vicar does not. And if God is leading you to spend more time with your kids and less time in church, then it is wonderful that you are able to devote that time to them.
As for not putting your children first - what rubbish. Children are a gift from God! Even Jesus thought it important to spend time with children.
I know that churches need money to operate, but when churches say that tithing is a precondition to getting into heaven, that is simply not bible based and makes me very concerned about the rest of their teachings. Certainly the bible says you should tithe, but it does not say that if you don't tithe you won't go to heaven. You can't earn your way into heaven (by tithing or any other means) the only way you get there is by God's grace and through the sacrifice of Jesus. If you could tithe your way into heaven, you wouldn't need Jesus, would you?
There is nothing wrong with shopping around for a church that feeds you spiritually. When we left our old church (because we moved away from the area), we spent THREE YEARS church hopping! We'd go to a different church each time and nothing seemed quite "right" for us. And for months at a time, we did our own study and did not go. It was a very unsettling time for us, but we just felt that God would let us know where we were meant to be, when His timing was right. We are now very well settled in one of the first churches we attended. Of course no church is perfect (made up of imperfect people!) but you need to go where you feel God wants you. TBH at the time we needed the break from being committed to one place.
If you are going to do self study, take care not to become isolated. I watch the teachings on www.joycemeyer.org - she has her tv teachings online so you can watch any time you want. Try and keep up your bible study (or join another). Many bible studies don't care what church you go to.
As for loosing your job - again, it is something you need to pray about, but if God is leading you to a new church He certainly will not forget to provide for you financially (either by making sure you can keep your current job or move on to something better).
Sorry you are going through a tough time.
I'll keep you in my prayers.
God bless!