I broke mine clean in two but didn’t have a noticeable lump until swelling went down.
I’s say the most obvious thing is a LOT of pain if you move your arm, you won’t be able to lift it. I got shooting pains right down to my elbow, which got worse after I had an op to fix the whole thing.
It’s an absolute bugger.
Best get it checked out though, as the sooner you get into the system, the better (if you need an op to fix it, time is of the essence, as the bone starts to die, and doesn’t like growing back after a while (I had two ops over 9 months last year too fix it).
All in all, Mine took exactly a year to mend.
Hope it’s not broken.