Your first reference points out the difference between a lateral ankle view versus an oblique view. The oblique view is taken from a lateral position but the joint is tilted so that the rays travel parallel to the joint surface. Otherwise, a lateral view results in superimposition of different parts of the joint being imaged rendering it unclear.
Not neccessarly. If you're in acute pain then you should definitely go to the doctor or emergency room.
But I've recently overexerted myself biking and jogging and it took about 5 days for my aching calf muscles to get back to normal.
Veins pop out when the muscles are strained.
Muscle builders try to get them popping out with constraining the blood flow by tying something to their arms. The compression socks and pantyhose may work in a similar way.