The Last Year I Noticed My Right Eyelid Is Dropping

The last year I noticed my right eyelid is dropping a bit and it's noticeable. I'm 57. My eyesight is ok. I can move my eye ok. I do not get headaches. But it is noticeable. I do get my eyes checked regularly. My sleeping is not very good though. It hasn't been in 2 yrs because of the death of my daughter. If this is from stress. Can it be fixed? And how. If not, what is it and what am I to do?? Thankyou. I don't see it getting better. Help! Ariana