I Have Tendinitis In My Thumb. It Isn't A Result

I have tendinitis in my thumb. It isn't a result of trauma just repetitive movements through out the work day. I went to my doctor and she said put ice on it and let it heal. It has since been a month and it has improved but it's still inflamedm. My thumb still stays in a bent position sometimes and occasionally hurts. What should I do?