[Botox] Review of eye area botox and skin botox

I've been getting botox around my eyes for about 4 years now because the area around my eyes wrinkles every time I smile. I've been getting it every 3 to 4 months. If I get it right, the wrinkles around my eyes are almost gone, which is great, but I don't think I'm resistant to it, and I feel like the effect is fading away faster as I get older. If I get it more often, I can develop tolerance, so I get it at least every three months, but this is a bit disappointing. I only got Botox around my eyes, but I wanted to try something different, so I got skin Botox, and wow... It really hurt. I'm good at enduring pain, but it was so painful that I cried. I almost screamed at the doctor, but after getting it, my face glowed and it was nice. But considering the cost-effectiveness and the pain, I don't want to get it again.