I'm asking for advice here before I try wrestling with the HMO on this one. I have "lower back syndrome" with a little sciatica which hits hard when I sit in a regular chair mostly immobilized for more than a couple of hours -- not so much while sitting, but after getting back up. The thought of a trans-Pacific flight (followed by two more connecting flights) in economy is really worrying me. I may be unable to walk for a couple of days. Huge numbers of people have lower back problems and fly, presumably. Is there some medical solution to this I should ask the doctor about short of the epidural injections I've heard of people actually getting for this but would be impractical for me? Thanks for any useful advice!