Hypospadias surgery/testosterone cream side effects

My eight month old son had surgery to repair his hypospadias two weeks ago.  Since then, it's been impossible to get him to sleep.  At first I thought it was because we let him sleep in our bed for a few days after the surgery, but now I believe it's a side effect of the testosterone cream that we had to apply to his penis for a few weeks before the surgery.  His temperment has changed--he gets upset so easily now and is not easily consoled.  He used be a great napper and sleeper.  He still gets tired at naptimes and bedtime, but screams as soon as I put him in his crib.  He'll cry for hours.  Did anyone else experience this?  How long did it last?