I’m 21F and I’ve been on 30-40 mg of Fluoxetine for 5 years now. My anxiety and panic attacks have been well managed, but after my most recent refill of Fluoxetine, I’ve honestly felt like I quit medication cold turkey. I’ve been 100% consistent with taking my medication, yet I started having daily panic attacks for about two weeks. For two days, I’ve taken the same dosage, but the pills were from a different manufacturer, and I feel almost completely back to normal. Could the specific batch of pills have had something wrong with them and has anyone else ever experienced this?  I’m at a complete loss for how my anxiety could go from almost non existent to incredibly bad back to very manageable within a couple of weeks without any major changes in my life. 

TLDR; fluoxetine seemed to stop working, took same dose from different manufacturer and feel fine.