a mis-aligned saddle could've also thrown your position off balance which could explain the pain in your shoulder.
I agree tho on the low-calcium/calf pain. Try taking an extra calcium supplement or 2 - or heck take 3!!!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"