How long things should take?

Hello
I had an injection in my right wrist 20 days ago and I have seen some improvement in my Carpal Tunnel symptoms. The numbness is now not as frequent as it was as I can hold a book with my elbow bent now for more than 60 seconds without my fingers going numb, however I am still having some issues.
I am still getting a feeling of numbness in my fingers although not as extreme as it was previously and I am still getting pains in my wrist joint. I am also still having trouble gripping a pen and writing for more then a few sentences and sharp pains in my hand if I hit/catch my wrist on anything (which as I am quite clumsy is at least once a day.)
I have been trying to wear my splints that I have been given every night but sometimes I have woken up to find that I have taken them off.
Any help or advice you could give me would be greatly appreciated.
Kind regards
Samantha-Jane.