in 2011 one morning walking down the stairs i had a really bright flash, went to rayong bangkok hospital (RBH), was told to come back in 2 weeks for a further check up, before the 2 weeks were up riding as a passenger in a car i lost the sight completely in that eye, went back to RBH this was a Tuesday, was told to attend Pattaya Bangkok Hospital (PBH) on the Saturday as i had a detached retina, instead my wife drove me to Rama hospital Bangkok where i saw a DR Somsiri (https://www.bumrungrad.com/doctors/Somsiri) she referred my to EENT hospital ( https://eent.co.th/) where she operated the following day, to repair the tear, refill with gas etc. since then i have not had any further problems other than a cataract op.
op do not delay get it sorted asap don't wait for BPH, as i did with RBH and as a result lost vision in that only albeit only temporarily, i can not recommend DR Somsiri highly enough, she works at other hospitals as well as EENT and Bumrungrad, from memory i think she works at EENT on Saturday and Sunday, go somewhere today and get it checked out, best of luck