You have until November 13th to activate your visa you will receive a 60 day stamp from your entry date if not activated by 13th November you will need to re apply for said visa
It's thailand and nothing happens fast in paradise and you need to adapt to thai pace of life remember even if you retire and live there it is still their country and if the house rules are not to your liking than find a house where the rules are to your liking nobody is holding you there simple π
My understanding is the only way a medical visa is granted is if you are in hospital on your death bed and unable to fly out of the country Chokh di with that one
You need to ask your airline if you are denied entry for what ever reason it's your airline will responsible for your return flight home thai immigration will not give 5 flying cares about you flights