I heard this is pretty normal in the beginning of treatment. It seems that the hairs go on a cycle, they fall and then new hairs grow back, stronger. Research it!
About the sides, nobody is going to be able to tell you how it's gonna be, other than their own opinions and experiences. People experience it in different ways. Some people just a bit, not noticeable, some people a lot, and in different times, i took it for 10 years and quite sure i experienced sides during this time but they didn't affect me much, until a few months ago, i had several issues with sides. so.. it's really hard to tell, everyone is different, times are different. You might not even notice them. Good luck