M.M.
Hi L.,
Man I so know what you are going through. My oldest son did that until I started making a game out of it. There are some toilet toys you can buy to help them become more relaxed and excited about going to the potty. It's worth a try. When my youngest son came along and he started acting like that, I was so glad my oldest had taught me what to do....hahahaha
Good Luck to you.
Peace & Blessings,
M.