I am considering getting Botox.

Lately, every time I look in the mirror, I am so self-conscious about the wrinkles on my forehead and around my eyes that I am seriously considering getting Botox. I'm worried that side effects might make my facial expressions look unnatural or cause me to have trouble opening my eyes. I'm also scared that I might develop a resistance and end up with deeper wrinkles.
I'm especially hesitating because I've seen a lot of reviews saying that people couldn't open their eyes properly after getting forehead Botox. I heard that once you start, you have to keep getting it, so I'm worried about the time involved, in addition to the cost of periodic maintenance every 3 to 6 months. I'm also worried about developing a resistance. Am I worrying too much...? Haha.
Lastly, I am also curious if there is a significant difference between domestic and imported products in terms of effectiveness or tolerance. Could anyone who has received Botox treatments—whether they had good results or, conversely, experienced side effects—please share some advice? I am really struggling to decide if managing it as a preventative measure is the answer.