Hey man, I've been where you are, killed my wrist with excessive programming and writing in my case, please PLEASE let it rest, don't keep drawing! I kept going just mitigating the pain and now the damage to my hand is permanent, I can't even play fighting or action games anymore without it cramping up and the pain flaring.
What immediately eased the pain was learning to lift my wrist from the table, not press down on it, and frequent hand and wrist stretching, also a wrist pad helps.
Get well soon, your health comes first!