Dear Catlaw7, thank you for your question. I am sorry to hear that you are experiencing several problems following your breast reduction. Without a photo it is difficult to advice however, if you say that you do not have a nipple on the left side, I would advice you to go and see your surgeon. You might have suffered a partial or total nipple necrosis, a fat necrosis or a significant delayed healing. Contact his office and I am sure he will be happy to see you and assist you.
All the best with your healing.