My doctor prescribed me a branded sertraline 50mg daily for two weeks for OCD (musical obsession). In the first two weeks, I felt great and the volume of music in my head has reduced significantly. I was able to think clearly and make clear decisions that were hard before taking the medicine.

Later doctor recommended the generic version of sertraline for another two weeks and increased dosage to 100mg. After taking it my symptoms came back and then he increased dosage to 175mg for another two weeks. So I'm on generic for a month now but I still do not feel good like when I was taking branded version? my symptoms are back too. Could it be a difference between these two versions that cause this?

Thank you!