My 5th toe is sensitive for 8 m. now. One foot only. It has something like callus on it, gets painful in any shoes. I am limping by the end of the day?

Be seen. If you have concerns, I would not hesitate to be seen. An exam and possibly an X-ray will likely show the cause.
Shoe. Your shoe is too narrow. Nobody's feet are exactly the same size. Some people have a wider disparity. AS we get older our feet get wider and longer. Your shoes may not be exactly the same, either. Go to a shoe store where an experienced person can measure your feet, both of them, while standing with full weight.You probably need a larger size. Some need a different size each foot. A shoemaker can.