Why do I have hand cramping, forearm tightness, difficulty writing, fine movements?

Something wrong. There is some disorder going on involving the neuro system or muscle system or more likely one of combinations called 'neuromuscular' disorders'. This is actually a complex differential diagnosis, and I would refer you to a good neurologist (such as arielle kurzweil, chief resident neurology, nyu, whose presenting paper in ireland--today is bloom day, celebrating their hero, james joyce-:).