Please help, any advice?

Soak your finger for 15 minutes several times a day either in hydrogen perxoide or in a mixture of half warm water and half unscented antibacterial liquid soap. But nail infections can become serious, so most likely you need to see your doctor again, especially if you think it is not healing. Watch it for signs of really serious infection, such as red streaks coming from the site, as that would mean the infection is spreading throughout your body and you need to get to a doctor or the ER right away.