Hi Sumac
I hope that you have also seen Hil's review by now.
From what I can remember a couple of hotels had oxygen canisters but it didn't bother us because none of us needed oxygen. I certainly took Diamox (acetazolamide) with me but only took a tablet on the first two days in Tibet as did a few others. I think most of us got a little breathless but nothing untoward. Apparently there is more oxygen in the air in September. It was warmer, too, than in may when Hils went.
I was quite anxious about this holiday as I had a serious problem at Macchu Picchu.
Try to make sure that you are as well as you can be, because illnesses are exaggerated at altitude.
If there are problems the JY tour managers are excellent and always sort out problems.
Apart from Diamox,I took immodium, paracetamols, lemsips, plasters, savlon, insect bite cream, anti histamine tablets (didn't take mozzie spray, but perhaps should have done). This is without all my prescription meds. I packed them all apart from some of my prescription meds in my suitcase. Kept some presciption meds and a change of clothes in my handluggage in case my suitcase went astray. No problems with check in (think you are supposed to take your doctors prescription it self with you though, I didn't). Wet wipes and handgels really important. I also took anti-biotics, got a private prescription from the GP, who gave it willingly after I explained why I needed them.
As for long days, apart from 3 days all our departures were in between 8 and 9 am.Our longest day was when we travelled from Zhendang back to Lhasa for our flight to Guilin via Xian. We left the hotel at 7.am and had a boxed breakfast on the coach. I enjoyed seeing the sunrise over the Himalayas on this 2 hour journey to Lhasa. By the time we landed at Guilin it was 23.15 (flight delay). Gone midnight when we got to bed. Guilin and the Li River well worth the long journey!!
I went on this trip with an open mind and was so glad that I didn't cancel for whatever reason!!
Enjoy the Roof of the world.
Kind Regards
Di