Fluoxetine 60mg for ocd

Hi,
so long story short I have ocd and have just increased my dosage of fluoxetine to 60 mg. Previous to this i have been on 40mg for approx 4 years- ive had one doctor say 60mg should only be used for 6/8 weeks then dropped back to 40mg, and a seperate doctor say that 60mg is perfectly safe and to stay on it. Is anyone else out there on 60mg?? i seem to be improving and tolerating the higher dose well so not sure what to do. thanks x