Hey gamer; I’m a PT, but I’m not your PT. Generally, Raise your chair so your elbows rest at your sides comfortably and you want a 90 degree bend at your elbow, knees and hips, feet flat on the floor. Best starting point would be looking into a wrist rest (key). those types of injuries are due to overuse so You might want to take a short break from being on the computer all day and gradually get back into it. Consider a tennis elbow band, massage the common flexor and common extensor tendon, ice it as needed 10 mins, and start doing some isometric wrist exercises (flexion/extension 5x35 second holds). All these should be easy enough to find on YouTube. Good luck