I finally decided on a Medicare Supplement. I have the policy number. I have the activation date meshed with the cutoff date of my other insurance. I think I've picked a good one. I won't know if it does what the representative says it will (and the information packet) until I use it. I'll have to wait and see. But the stress has gone away for now.
I've also signed up for a part D prescription coverage plan. I picked the absolute cheapest one out there because I don't plan to need it. But I made sure I have one so if I do, I'll have it.