When did I become so physically clumsy?

I fell down the stairs last night with E in my arms, she’s ok, I landed on my less dodgy knee and hand. Got quite a shock and started to have a panic attack because I wasn’t expecting the pain. I was able to turn the pain off but then remained in a hyper state for hours. Lying in bed wide awake knowing the pain was there but separate from it, but that humming in my brain was there. Very familiar. Waiting.