>1. Am l eligible for a 30 day extension after Sept 26?
According to
***********************************************
ครม-เห็นชอบร่างประกาศ-มท&fbclid=IwAR2HdeUZRPwVQrO_NzdbgHcJjVXZJV8pZP6zzH-CASt7SOsPAm6NbOJ_5tQ#iLightbox%5Bgallery_image_1%5D/1
No, you must either have a COVID-19 letter from the embassy, OR a medical reason why you can't leave.
>2. Am l eligible to apply for an ED visa?
No, ED visas are not being issued inside Thailand right now. Period. End of story. No exceptions.