Chiangmai medi clinic near wat jed yod is a good first choice....experienced doctor perfect English......not expensive ....the clinic is immacutely clean....close to maya shopping centre...
There is 7 days grace period to lodge a 90 day report late so you have no problems there at all.....just fly out I seriously doubt you will hear anything about it at all.....
If you look at your bank book you will see on the left hand side...FTT..this shows the money originated from an overseas source....FTT....foreign exchange transfer...its that easy