I have done alot of flying and as far as I know there are no special accomodations (?) unless you are handicapped. The only time I was ever offered assistance was a few years back in Mexico. I was there on vacation and had 2 emergency surgeries, my drs had to write a letter stating I was fit for travel before being allowed to board the plane. I was in a wheel chair and I was placed on the plane before anyone else and did not have to go thru any of the long lines.
One thing you must do if this will be a very long flight is to get up & down and move around to avoid potential blood clots in your legs. This is a very serious thing the airlines are now warning passengers of.
Just be sure to take your medication as usual and have it on your person and not in a suitcase. If you are not on a muscle relaxer, I suggest getting one from your dr, it will help you relax those muscles. Good luck. Susie