Well, yes, and hence the idea of some type of sleep aid or muscle relaxer for the trip, @slobberchops. Pacing the aisles for 12 hours is not a good way to go.
FYI - All pharmacies in central Bangkok have English speaking and Western trained professional staff. They are on almost any street you walk on and at the airport. If you are hurting, go in to any one of them and tell them what's up.
They will sell you narcotics or prednisone otc for very, very cheap - 10 - 20 pills usually. They do not do this for anyone off the street, but a Westerner in obvious pain, they will help.
There is no advil or aspirin in this region but they have panadol/tylenol in packs of 20 for cheap.
If you use magnesium oil for pain, bring it with you. It can get rid of cramps on the plane. This is very expensive here if you can find it.
OR
Go to the plane galley and get fruit juice, water and salt for cramps. They will give it free on a plane. I often need it.
I have Rheumatoid Arthritis, so completely know how you feel.
