I have the same problem I even looked at the settings and discovered the Thai language was not ticked for translation I think FaceBook Needs to sort this if enough of us complain maybe they will sort this problem
I would always make a will in Thailand and make it clear what you want doing to your body when you die and who the house belongs to also who has any money that is in your Thai bank accounts and have the will written out by a professional
If the pharmacy can not help you I’m sure if you see a Dr at a nearby hospital they will be able to give you something but yes bring some supplies with you until you can find out where to buy the stuff you want good luck