Sounds like you were NOT running a business, but the business you built was running you. In other words, you created a job for yourself, rather then a business.
Yes, that's probably very true but it's amazing how long it took me to realise and finally bite the bullet to move on. Basically I really enjoyed running my own business but I didn't like the business was running. It's also really hard to walk away from something you built and was actually bringing in a decent profit (and still is for the new owners). As a disclaimer I still don't like what I do as its in a similar area, but the reduced stress and stable pay check make it more fulfilling, especially whilst I save up the collateral and figure out the actual business I want to run.