I would be more concerned if you were not under waiver review. Being under review means that you are still in the running. It can take till spring, or sometimes summer, for the process to run its course. Though the letter from the Dr might be helpful, the requests for AMI is what will make a difference. Though understand not all DQ's require AMI. Some DQ's are waiverable, some can only get a certain amount of waivers each year, and some are not waiverable at all. Since you are under review, you are still in the running. Just be patient and work on plan B,C,D. Good luck!