If u want ur PES reviewed, most important is to have ur doctor's letter, and if possible get a specialist letter from a government hospital.
Now, the next thing u do is to call up ur unit, call up the G1, S1 department and speak to the NSF / DXO or whoever is in charge of u. Tell them ur condition and ask them to schedule u down for a medical review.
Of course, as always, most likely they will forget u, so if no response in 2 weeks, call them again and again and again every 2 weeks. They are able to schedule u to see the mo every week if they want to.
so when u come down to see the mo, of course show ur letter and explain ur condition etc.
Afterwards, if he really think ur PES needs to be reviewed, he will schedule u for a medical board. there are 2 kinds of medical board - medical board in presence(MBIP) and medical board in absence(MBIA). U can choose the kind u want, but most likely they will choose MBIA so u dun need to come down again.
Wats a medical board? a medical board is just 3 mo sitting down there and review ur condition. From there on they will review ur pes status on the spot.
From the time u see the mo the first time to the time for a medical board takes quite some time. Normally there are medical boards every 2 weeks, sometimes once a month, so it will take some time.
most important is when u see the mo for the first time, go and get the telephone number of the medical center, so that u can chase them for ur medical board every 2 weeks or once a montn.