First of all, remember that the scale is a great tool but the mirror is the true result. Weight fluctuations are pretty common when you begin a new diet, many things may happen, glycogen...
Your wrists hurt because you have an elbow valgus. It's very common so no worries. You can go for the EZ bar, don't worry about "inner" part of the biceps and all that BS... EZ curls works...
Apples are no different from any other fruits. I mean they contains some vitamins minerals and all that good stuff but you could eat banana or berries or any fruit instead. Unless you are...