What should I do if I need a medical extension in Thailand after already using my 30-day visa extension?

I’m under care by a surgical doctor after a tummy tuck healed I got bacteria in tissue and am under same surgeons care for daily cleaning of an open wound that cannot be closed until 100% bacteria infected tissue is all removed and cleared. He’s ok with writing letter for a month or two as an infection that’s uncleaned for a 24 hour plus flight back to US could become massive issue as it’s also time before flight between his last cleaning and the next cleaning in USA (any American knows that’s not the day I arrive back). I am in Bangkok, I do have a surgeon willing to put 30-60 days under his care for open wound infection post operation, and I do have condo rented for another month. I also have significant cash still on hand as well as credit that I can show. The only issue I had was the concern I was cancelling a 1st class flight home without a guarantee of extension for medical because the immigration offices are closed until the 5th my flight was today.

I decided I’d risk it and hope Thai government approves extension for atleast a month with surgeons letter.

This may be true except the surgical center I had my surgery at isn’t getting more money. They are cleaning and re dressing my wound daily. The surgeon does this cleaning, uses general anesthesia for deep cleaning now 3 times. Supplies me with antibiotics as well, ALL at not a single additional baht. So yes I’d had thought twice had they been charging me but they aren’t at all.