I am going to put my two cents in now.
I would try to do all purchases, like anything you don't have a monthly budget for pay CASH, don't use credit, debit, or checks.I have found that when you pay in cash you have a bigger tendency to watch what you are spending, as when it is gone, it is gone. I have a budget for all our bills, and have worked them out to:: Yearly, Monthly, and Bi-Weekly as DH gets paid every two weeks. It takes about one year for this to all come together, but in a year you really learn where you money is going and where you can alter your budget to pay all the bills as they come due.
I added, divided and multiplied and put into our checking account only our bill money, the bills that I have to send out, electric, gas, phone, etc. I also included our ins. and property taxes, in this budget, to be sure that the money for those bills was there, when we needed it, and we didn't have a big outlay from one paycheck. Example, our car ins. is due every three months, and it about $375.00 so by doing our budget I deposit a certain amount of money, the same amount of money in our checking account every pay. I save 20% of DH's gross, and I allow $200.00 per pay for our groceries, and I have my Daily Savings Plan, for our Christmas gifts, $10.00 per pay for our Birthday fund, and $40.00 per pay for our Horses, this usually pays for all their feed, getting them shod, and their Alfala cubes of 1 ton a year. I always need about $1,100.00 a pay, to pay for all our expenses, savings etc. That way, when he works overtime, it is money in the bank, as we try hard to save most of the excess, to have for our savings account.
One drawback to this is when I tell DH how much we have in our savings account, he almost always "needs" something, so I have taken to not telling him how much we have. Not a lie, just not all the truth. LOL
Good luck on your new life change. Hope it helps you to control the IBS/Fibromyalgia better.
...and may the Lord bless us, with all we need. AMEN