Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the pain in the hand with difficulty in closing the hand and pain in the fingers etc.
The most likely possibility for the symptoms you have mentioned is the arthritis of hands and wrist and that needs to be ruled out in consultation with a rheumatologist. It is important to rule out rheumatoid arthritis etc.
Hope this helps. Take care.
Note: This post is for patient education only and not for definitive diagnosis as the same is not possible online.