I'm being deadly serious when I say this, but you NEED to go to A&E for an X-ray. I did exactly the same thing about 4 months ago and it turned out I'd fractured my coccyx. 2 1/2 weeks signed off of works and a good 2 months or so after that that I felt ok to get back on horse back again.
I felt sick to my stomach when getting back on as I'd lost all confidence, legs and arms shaking, too frightened to put into canter etc, you name it.
Since then iv ridden a few times and been rebuilding my confidence at my own pace. I'm now back to a full gallop and popping small fences and feeling comfortable about it.
So first things first, off you toddle to A&E, get your results, rest up AND THEN think about your confidence with your horse