Yep, he's a weirdo! HAHA!! Just kidding, how could I even joke about my beautiful surrogate DS like that!! I do get how challenging this is, especially given your current physical (or lack of) abilities. Ride the toddler wave, and if need be, throw yourself on the floor next to him and tantrum away too
DD was EXACTLY the same at that age. God, sometimes I felt like throwing her over the fence to the neighbours! It started just before the arrival of DS and heightened probably just after hs arrival. Basically, independent action, desire, will and thought are developing rapidly now at this age. Your DS is completely normal. So was my DD.
Stay consistent with your DS, use distraction and other strategies to focus his interest elsewhere if a tantrum brews/erupts.
Keep me posted doll xx