Well make sure you've got yourself a new helmet.
Poor girls.. I've been there. But I make myself get back on. Even when I got bucked off of this mare and landed on my head, I was in tears but got on and made that horse walk and trot just as we were doing. Then I got off on a good note and cried lots.. hurt soo bad all over. After that ride took me 2 weeks to get back to it, I was so scared.
But what helped me was knowing my limits and respecting them. I knew I was anxious to even sit on a horse, so I took my time getting used to them on the ground, then we'd walk and I'd get off. I'd never push myself too much, and I gave myself some extra confidence each time. Within a week I was back on my boy (which I was leasing at the time) and working through his spooks and stuff :)
Be kind to yourself, get ahold of some calm horses, and if you do take lessons be clear with what kind of instructor you want. One that gives you lots of time to cope or if you do better with people bossing you around telling you to suck it up. Sometimes you need some of each, honestly.
Best of luck, you'll be back to loving it in no time :)
"Strength is the ability to use a muscle without tension"