Fished out from memory

Oh my dear grandmother!
You fed me juicy fish,
And fulfilled my wish
You told me to eat the fish's head to make my wits sharper
But the very thought of it made me nauseous and lather
Eat the fish's head will you? You said again and again 
Though we never came to terms, 
I am still sorry for not holding up my end of the bargain
Now there is nobody to tell me to eat what I do not feel like
Yet, I am ready to overcome this feeling of disgust and dislike