What are the risks of leaving Thailand with an ED Visa and returning, and which hospitals are recommended for neurosurgery in Bangkok?

[ED VISA question]

Hi all,

I have applied 8 month ED VISA and expected to received it in March. however, I was injured yesterday and feel an unusual pain on the lower part of my back where I had surgery 5 years ago. I plan to go back to my country however my language school suggests there is risk to be rejected at border when coming back, as ED VISA holders are not suggested to leave the country.

My question is does anyone has experience leaving and entering again Thailand with ED VISA? I wanna know what options I might have and plan for the worst once it really happen cus I haven’t even started my courses yet.

Another question: any recommended hospital in Bangkok for neurosurgery?

TIA