Great! It should make you feel much better about things!
Yep, defo Sudafed, 30 minutes before you land. Drink lots of water on the flight especially during take off and descent. I didn’t take anything other than the usual Ami, the dose timing of which I slightly modified to take account of the extra 8 hours (I took one pill instead of two, then another 8 hours later). I’m sure the drowsiness SE of that drug actually helps you reduce the jet lag. Speaking of which jet lag was no more of a problem than when I was fully fit.
The great thing about travel and holidays is there is LOTS of DISTRACTION which helps you focus on life rather than the horrid monster. I found despite symptoms on holiday I felt mentally much better.
I was quite surprised how little problem it was for me, even a long haul. Actually I believe the long time sitting up actually helps take pressure off the ear and lead to some healing because there was a big step change improvement in my condition by the time I returned to the UK. The only big issue was the tinnitus after the flights which was definitely worse but calmed down as it always does a couple of hours later.
Have a great time and try and focus on enjoying the experiences, brush the monster away vigorously!