Re: chronic wrist pain
1st I would determine if it was training that was the cause of your aches. Take a week or so off and see how you feel.
I find alot of newer people in Aikido tend not to move their feet when technique is applied to them. Moving your feet can help especially when dealing with sankyo, kote gaeshi and nikyo. So move in accordance when you feel pain.
I found weapons work can build up your wrist strength. As well as doing the basic wrist warm up exercises during the day