P.R.
That is a tough one, but I went through it for a short spell with all of my children. If they asked for something and got it and had a fit I took it away and they went to their time out high chair for two minutes and had to be quiet for one minute before they were allowed to get down. If they asked for the same item again they were simply told "no" and if a fit evolved it was back to the chair.
I stopped giving choices for awhile as well about a lot of things. I gave them what I wanted them to have and didn't ask if they wanted apples or peaches, or whatever it was. I just did not give them a choice. If we were going to have play time I would offer to play with the blocks or put together a puzzle or whatever. If they didn't want to play with what I offered then play time with mommy with over and I went and did something else.
Good luck I know how trying it was.