ditto on the arm/collarbone connection.

When you are healed up, maybe you can go to a road cycling clinic. They also teach you falls sometimes: I learned how to let myself fall onto grass on an incline. I don't "do it regularly", but maybe it will teach your neuromotor system not to stick your arm out if it happens.

A friend told me you have to take cracks at an angle - can't do it head on like I did with the fatties.
eh ? - maybe you misunderstood your friend, or I am misunderstanding you. You have to go over cracks, tracks and such at a steep angle, best is 90 degrees like so --|, so "head on". Don't cross them on a narrow angle like so /|.

A road clinic will teach you other useful stuff to handle your bike.