Can ptosis from Botox cause permanent eye dropping issues?

I went to a board certified plastic surgeon in 2008 for botox. Was new to botox and didn't realize she was having an assistant inject it, resulting in severe eye ptosis in my right eye. The severe ptosis eventually went away, but whenever I am tired or have had 2-3 drinks, the eyelid droops. Is this a result of the botched botox or just something normal w/ age? Never noticed the problem until after the awful botox incident, but that could be because I just didn't notice it. It really bothers me