I'm having stiffness from my elbow along the forearm, which is worse in the hand and middle and ring fingers. stretching helps, but just temporarily.

A chance of: carpal tunnel. Please see your family doc for starters. He/she may suggest splints to sleep with if that's what it is. Small surgery is used for more advanced cases.

Must consider arthri: we would consider arthritis is one of the problems. You need an evaluation to clarify exactly the cause of the symptoms. You should ask your physician to have you see a rheumatologist says that this can be defined