Proffesional taping is always better but a regular cost is involved.
The condition needs rest and you use hands all day so stop any hand pressure. 4-6 weeks.
Bag of ice will do.
It is likely that you will need the support on wrist even during daily activities. However once healed you can just wear when excercising.
There are a couple of ball devices to strengthen grip (handmaster) and another spinning ball thing that help for wrist mobilisation.
If condition has been going on after following this protocol get ultrasound stimulation.