When does my employer coverage actually end? - 12 months and counting

I was told my coverage ends on my last day, but the letter says the end of the month. I am in Tampa, in case local advice matters. The letter is unclear about dental and vision. What should I do about appointments?

Thanks for writing this out. I went through something close to it 12 months ago, and it got easier once I kept a simple log of every call and form.