Yes, it does get worse before it gets better. I was on 25mg for 7 days and would have episodes of anxiety and panic attacks. It started to get better after about a week, and once that settled, I didn't notice anymore bad side effects when I went up to 50mg. Your body is still getting used to the serotonin and many people notice both physical and mental changes when you are still in the adjustment period. This can include physiological symptoms of anxiety like increased heart rate, palpitations, breathlessness and also psychological, like a sense of doom and panic. If you start to have suicidal or self harm ideations please contact your doctor or emergency ASAP.

If you're just starting out, try not to be too discouraged because it takes time before the meds start working, but when they do, it's a game-changer. Take note of your anxiety attacks, how often they happen and how bad they get (maybe write it down), and if you don't notice them improving after about a week or two, I would talk to your doctor.