Re: Have to flush SIX-TEN times before all the water & 'stuff' goes down?!
There is probably something stuck in the neck of the toilet. Start with a toilet whip and see if you can dislodge whatever is there. If you don't get anything out, you'll need to pull the toilet, take it outside, flip it upside down and back-flush it with a hose and/or the toilet whip.
You'll need a new wax ring to reset the toilet, and probably new hold down bolts as well. You should be able to turn the water off right at the toilet, but have rags and a catch basin handy because you will get some water coming out of the supply line when you remove it from the toilet.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!