Fire your doctor and get a new one, immediately. She should be educating you instead of pushing any kind of surgery on you with little or no explanation. When you do, make sure you
1. Look at the lab report so that you know exactly what you have.
2. Get a full discussion of what you have (CIN I, II, or III), where it's located, how extensive it is, how many cervical quadrants are involved, if there is dysplasia in the endocervical canal, and if there is dysplasia in the endocervical glands. That will tell you, right there, if you need surgery, and if you do, which kind. Per the medical guides I have read, if it's in the endocervical glands or the distal end of the lesion can't be seen in the endocervical canal, then you need to go to a GYN/ONC who would do cold knife cone biopsy to further access you and because it has a better chance of getting all the abnormal tissue. But make sure you know exactly what you have before agreeing to anything.
3. If you do need surgery, get a thorough discussion about the risks and benefits of all your options - cryosurgery, laser, LEEP, and cold knife cone biopsy - before a recommendation. This is a requirement, and your doctor doesn't sound like she's educating you. Therefore, don't trust her.
4. If you need surgery, make sure the doctor is experienced. In addition, find out how many times per week the doctor does that surgery, how many times the doctor does the other surgical options, and how often the doctor sends a patient to another doctor if he or she isn't experienced enough to do a surgery the patient qualifies for. This will tell you if your doctor wants to do what is best for you or is just trying to make money.
I realize you are frightened. But knowledge really is power. It will help you take control of your health and make that important informed decision. Your doctor needs to work with you rather than just do something to you. Having knowledge will make that possible.