We used to have joint physical custody but two months ago they gave me physical custody to me now my ex only has visitations every 2nd and 4th weekend and every 1st and 3rd Wednesday of each month. My ex keeps saying that he can still get child support from me because he doesn't work and he is disabled.

That should have been decided at the time custody was changed. The current child support order stays in place intill it is modified in court.