Writer's Block

I am supposed to be writing a poem for my Grandpa's memorial. I am having the hardest time, which if you know me at all, is crazy. I can whip out a poem in minutes. I don't know what to write, rather serious or funny, happy or heartfelt, a little of each. I feel pressure to perform and it isn't helping. I am :( Maybe it will just come to me but time is winding down.