I know it seems like a long time for you, but that is pretty standard treatment. As Trudie said, they are 95 % benign and common.. Try not to worry.. Sometimes it may take longer than 6 weeks to totally resolve itself, but it sounds like you have a good Dr.who is watching it..
Over 95% of all cysts are benign but in many cases they can't be entirely sure until it is removed and biopsied. The waiting and wondering is very stressful. How long have you had symptoms?