As already said, capos are great for helping out with bar chords.
I used to experience the same thing after playing long acoustic sets. My thumb, hand and wrist would get quite sore and sometimes I would get quite bad cramps. The best thing I have done to help this is however is to stretch and strengthen those muscles and tendons that get tired. Each day before and after playing I stretch the sore parts and gradually I think they have become more flexible and stronger. If the pain is persistent and worsening it's probably best to talk to a physician so that you don't cause an injury.
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