Can someone help me with a thumb problem?

I have what my doctor called a "trigger finger". It's on my left hand and my thumb is what's affected. When I bend my thumb, the first knuckle sticks and I have to bend it back into position. It's most painful in the morning and before I go too bed at night. The doctor told me that the muscles in the palm of my hand get tight and that's what causing it. She told me that I would have to go to an orthopedic doctor and he would give me a shot. Has anyone else ever experienced this and what did you do? If you went to a doctor what did he say or do? She mentioned a cortisone shot and if that didn't work maybe surgery. Any help would be greatly appreciated1 Thanks!