What kind of conization did you have? Laser, LEEP, or cold knife? Where were the positive margins located? And what kind of positive margins did you have?
The first step that will definitely answer your questions and help you is to look at all of the lab reports. This will tell you what kind of dysplasia you had, where it was located, how extensive it was, and if it's in the endocervical glands. It will also tell you if the positive margins were CIN I, II, or III, as well as where the positive margins were located.
If you require additional treatment, it depends, once again, on how extensive the dysplasia is. Obviously, cryosurgery is not a good option, but you still have several choices. It sounds like you may also want to get a second opinion, just to be on the safe side.