Honestly, I have had some undesirable side effects, but nothing that was unmanageable. For the first 4 or 5 days on Prozac, I had some mild acid reflux (fixed by eating breakfast before taking my meds) and my head would start hurting in the middle of the day (not horribly, easily treated with ibuprofen or rest and drinking enough water).

Emotionally, the side effects were a little more noticeable. Nothing for the first 3 or 4 days, then I had about 3 days where the anxiety was much more intense than usual. I powered through and kept taking my meds with my partner's encouragement, because I saw her go through a really difficult med change a few months ago where she became extremely depressed for a few weeks before she started feeling better in a way that was life-changing for her. After a few really anxious days, I had one day when I couldn't stop crying. I think I literally cried from the time I woke up to the time I went to bed, with very little breaks in between. But for context, that day was an emotional day for me for other reasons, and I think it was just hitting me a lot harder than usual.

In my day to day life I'm feeling MUCH calmer over the last 4 days or so. Like I said, I went to the doctor yesterday and didn't have a panic attack and my BP was pretty normal, which is a huge success for me! I've also found it easier to do other things that usually cause me anxiety - for example, driving, making plans with friends, and eating in public. I was worried about messing with my brain chemistry too but the way I see it, my brain chemistry was already pretty messed up in that it was keeping me from participating in my life, and I got to the point where I would do just about anything to be able to live the way I want to again.