s. I know how difficult this may be to deal with. We had a similar fall when DD2 was 4mo old and she was in the care of my 20yo sister. While at the dr. for another child, I took my DS1 to the bathroom and left my 3 other children w/ my sis in the exam room. DS2 got mischievous and my sister put my 4mo DD on the exam table, forgetting that she was already rolling. DD rolled off the table onto the concrete floor, a 36" drop. She had a HUGE goose egg and bruise forming. DD ended up being okay, but like you, I was hesitant to get the CTscan. I didn't want to put my baby through the trauma of it, but DH insisted. And y'know what, I'm glad we did it. The relief of knowing there wasn't a brain bleed was worth having her cry for 5 minutes strapped to a board.
My family practitioner, who does NOT believe in fear mongering, told me of his nephew who was 9mo and fell from a table while sitting in a Bumbo seat. Since he showed no signs of trauma, they didn't take him for an x-ray. The next day they were in the ER b/c he had a brain bleed for the fall. He's okay now b/c they caught it, but it could have been a lot worse.
The ER doc told me when we brought DD2 in that standard protocol for any child under 2 who has signs of head trauma, a bruise, a goose egg, a cut or gash, they do CTscans for. You just never know, and b/c their skulls are still forming, it's better to be safe than sorry.