Citalopram brand has changed...

Hey my dudes! Really hope everyone is well :) Just hoping that others can relate to this recent experience with my own journey with C! Just a few days ago nipped to the chemist to refill my prescription for the next few months and the brand of citalopram has changed. Happened before so no biggie... Been taking the new brand for 4 days now and I 100% feel like something is different. I've had the aching jaw symptom just like when we start the meds and also a bit of a rushing feeling. It's not unbearable just feels very chemical and a bit uncomfortable. Been taking citalopram for 8 months now and starting to feel the time is right to come off the meds. Is it just my body adapting to the new brand of meds with some mini side effects or is my body trying to tell me I don't need the meds any more? Would love to hear from others about this. Thanks Jamie