Calm before the storm?

Wondering if anyone else has had a similar experience? I've been on 30mg Buspirone for 2 years. It worked ok until it stopped being as effective. Anxiety and depression have been ramping up the last few months so I got a prescription for 10mg of Prozac. The first four days were really wild, basically a complete lack of anxiety combined with sleeping like a brick every night. I felt really good and finally believed something might be able to help me after a 10 year battle with anxiety and panic disorder. Anyway, today I woke up feeling ok but around lunch time had a panic attack. It was like everything just felt too intense and I wanted to be in a dark room alone. Some derealization sprinkled in convinced me for a minute that it was the Prozac making me loose my mind lol I'm great at catastrophizing. I know it shouldn't work immediately but the first 4 days felt really profound. Now I'm afraid of my anxiety ramping up from here. I feel fine now but struggling to not worry about the panic episode. I've read so many varied reports on reactions and recovery time with this stuff. I've been hanging on by a thread these last months so really worried about being able to handle work if the Prozac is going to make my anxiety worse from now on.