I tell my students all the time that they are using muscles in their hand and wrist that they aren't normally used to using. It's like going skiing when you haven't done it in a year. As your hand and wrist get stronger, the more you work them, the less pain and weakness you are going to have. Just pretend like you are lifting weights and you are going to be sore for awhile but it will go away the more you use those muscles over time.