I lost my toe, the foot went grey. Where I used to know, A hole does stay. I found my egg, in a ditch was where. A root now my leg, the trench now a pair. I swapped my tree. And "oops" in the past, (Where could I be?) became "ouch" in contrast
Where on earth am I?
What I lost sent me from high to something just below
What I found sent me falling even further though
What I swapped sent me going between high and low
Adding the letter
nsomewhere on the first line would give you a massive clue.
It's important that you change your tune or die a critic.