Eyelid drooping

Hello. I had my surgery a month ago and for the second time that I’m aware of, today I felt a little pressure on my eye. I looked in the mirror and that eye, the right one, clearly wasn’t open anywhere near as much as the left, despite the fact that all my problems have been on my left. I called my surgeons office and left a message but he didn’t get back to me. I’m wondering if anybody has had this symptom. I don’t know if I should be scared. It didn’t hurt. I was just able to feel it but I can’t help but wonder the cause. Thanks. - TracyJessica