Totally agree. So many living from day to day. They live in Thailand to avoid enormous heating bills and Council Tax. Being accustomed to free National Health Service at home they make no provision for medical expenses.
There are expats living on their government retirement pensions. They may or may not have savings. It isn’t a problem unless they suffer a serious accident or illness that prevents them returning to their home countries for treatment.
You’ve done the right thing. Go to A/E as soon as possible. Not expensive in Thailand. You should be able to claim under your travel insurance (if applicable).