I've started to have neck and upper back pain on my right side likely due to the overstretched position of my right hand on the mouse. I been trying to let my left hand control the mouse for a couple of days to give some rest to the right side and was looking for some studies done on training the non-dominant hand. I found this article, would also love to know if others have done this or know of literature around it.

You might need to make dietary changes that facilitate changes in the brain more easily. I know choline helps with connections between neurons because brain fog from pregnancy, covid and chemotherapy is recoverable, and studies have shown that stumps are left on neurons where the connections will grow from again when enough choline is present. Thus memories can be regained, havent looked into whether it can help with new training though, but it might be a line of enquiry worth exploring.

Manganese helps maintain cartilage between bone and its something which we dont get alot of in our diet unless eating shellfish routinely, this can help prevent the need for neck vertebrae to be fused together which desk bound jobs can contribute to. The risk with manganese is it increases osteoporosis because bacteria love manganese, so a copper (slows bone turnover) or nickel increase would probably help there. Those with the highest nickel intake (from smoking or vegetarians) have the lowest incidence of osteoporosis, and a nickel and zinc increase will give the best bones because zinc increases osteoblasts (increases bone turnover) and beneficial bone turnover unlike phosphates which erode bones, see phossy jaw for example.

Taking beta alanine will also help mop up surplus manganese as it will be used in the MnSOD reactions, helping to keep it out of the hands of bacteria so to speak. Zinc starves some bacteria, but beta alanine also works with copper and zinc SOD's, thus helping to mop up any surplus.

You have little control where these metals go in the body, but too much calcium also alters the circulation of these metals in the body. The hard part is knowing what is the right amount in relation to with your existing diet.

Iron can also help relax muscles as can magnesium, which can reduce muscle tensions that cause back and neck pains.

I've tried unsuccessfully in the past being ambidextrous with the mouse but that was before I knew the above, so might give it a go in the future, but weight training will probably help rebalance the body and reset the muscle distribution and strength. I've even grown a callous where the pisiform bone in the hand is due to the amount of mouse work I've done on a computer, which was unexpected to say the least, and RSI in the wrists from typing at a keyboard is very real, with no solutions from doctors when seeking their advice, which is why I've looked into things like the above, myself.