I am so sorry to hear about your MS diagnosis, especially on a day that should have been exciting -- trying a new horse.
There is a theory that stress can lead to exaggerated MS symptoms. Your fall certainly sounds stressful to me. It sounds very traumatic as you describe it, so it seems likely any MS symptoms lying dormant would wake up.
Another thing to think about is the MS may be diagnosed at any age. I was diagnosed when I was forty — the difference is that I had several events before then.
Let us know how you are doing.
You may be interested in one of the earliest reported (possible) cases of MS. Lidwina of Schiedam is the patron saint of ice skaters and the chronically ill. About 1395, when she was 15, she fell while ice skating. After her fall she started having movement problems, pain, vision disturbances and a variety of other ailments (with periods of remission). Many people say that was the first documented case of MS.
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