{{{{{{{{{{{{{{BP}}}}}}}}}}}}}}}} You haven't "forgotten" how to play... It's your "Inner Child" that has receaded to the background. Yes, you need to awakend her, reclaim her. Anything creative that you can do will help... even watching cartoons, but I mean the OLD cartoons like Tom and Jerry, (hehe no pun intended) the Road Runner... things that make you giggle.
When you're babysitting, try as much as you can, to see through the child's eyes... the wonder that nature, animals, birds may cause in her.
When you're in a department store, take a detour through the toy department. If anything sparks your interest, go with it. You don't need to "embarrass" yourself. Just hold the toy and let your imagination do the rest... Imagination is also a key to unlocking the place where your Inner Child is.
I've been there, BP. I know how painful and difficult it can be.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.