Your photos do not shed much light on the nature of your problems so I will give you some general things to be concerned about when having a third rhinoplasty. Issue number 1 is to allow enough time to elapse between operations to allow for complete tissue healing. This means a minimum of 6 months but preferably a year since the last operation. Secondly you mention a number of problems after two operations, there is an unwritten rule amongst rhinoplastic surgeons that one revision is normal two is problematic and if a third is necessary you should consider getting another opinion. Lastly, each operation is not logarithmically harder, each successive operation becomes exponentially harder mainly due to scarring and a lack of autololous material for reconstructive purposes. Anyone recommending foreign material for a scarred nose should not be considered as your surgeon.