Hi Pintya ... Yes, the problem of writer's cramp. I am right-handed and I also had to learn to write with my left hand for a few months - but this was when I was in 5th grade and had broken my right arm!! I did pretty good I must say, to the point that I can still write a decent, hopefully legible note using my left hand. But joking aside now ...
I have a disease called scleroderma which causes one's skin to dry up and become tight, very tight at one point that my hands would not open fully. It caused problems all over the skin covering my body. Luckily a 3-year course of steroids helped to calm it down and now I'm back to using my hands again. This disease also causes internal complications, but that's for another forum.
I was a medical transcriptionist for 30 years - typing was my life; it was like breathing to me, a very creative process making sure that every document was correct. Then the scleroderma hit in 2000, and my hands just about turned to stone. One of the many off-shoots of scleroderma is a disease caused Raynaud's syndrome, which causes the small capillaries in the hands to stop flowing blood to the tips of the fingers and then progressively throughout the rest of the hand. Luckily, again, the steroids help, except long before they did I developed what are called "digital ulcers" - the skin on the tip of each finger and thumb turned black because there was no blood supply getting to them. This got so bad that after 30 years I had to stop my medical typing and go on disability. Essentially my fingers were becoming gangrenous - black as a night with no moon and no stars.
I no longer get the digital ulcers because the Raynaud's has calmed down, but because of the tightness of the skin on my hands I now get the dreaded writer's cramp. Just using a pen or typing a few lines causes pain to shoot through my whole hand. It has now taken me 30 minutes just to write this short note.
Okay, you might not have Raynaud's, but have you ever been checked for another insidious hand problem called "carpal tunnel syndrome"? It causes lots of pain in the hand and wrist, and can occur in both hands. I have that also, and I had surgery on my left hand to correct the problem. My right hand isn't as bad.
Really, see if a doctor will check you for carpal tunnel syndrome. In fact, there is a forum on this website just for carpal tunnel. Check into it - I'm not trying to give you a diagnosis, just a suggestion to check out this other forum. I sure hope it will give you some useful advice.
The first person to reply to your post today, joanne47212, gave some very sound advice - eat bananas. Sounds silly but our bodies need the potassium we don't sometimes get in our daily food, and bananas are packed with potassium.
I sure hope you find relief from your pain and cramps because who are we if we can't use our hands? Good luck to you and don't lose hope. Jamie (Gaiagal66)