Botox eyelid ptosis four months ago. No complete resolution yet

I got botox eyebrow lift 4 months ago. 4 units on each side (single injection) to achieve eyelud lift. A week later i got eyelid ptosis (worse on one side). I have some improvement and my eyelids are no longer asymmetrical, but not full improvement yet. my eyes are not completely open and this is more visible in pics. Also intensity of ptosis fluctuates throughout the course of the day. sometimes it gets better but then i look very sleepy again. i am afraid botox caused permanent damage.