About 6 months post-injury I traveled cross country the first day (5 or 6 hours) then to Germany the next day (8 or 9 hours), took a few days to recover and acclimate to the time zone change, then to southern Italy which took 1.5-2 hours (my husband had a work assignment there and we all went with him so I wouldn't be left alone with the kids and house for 3.5 months, I would not have planned a pleasure trip at that point!). I had my husband to help and "shield" me which was great, so it didn't matter too much that I wasn't all there. I used earplugs (regular or noise cancelling) most of the time and needed recovery time at each stop, more after we finally got to our destination.

Pretty much the same going back home 3.5 months later, except I felt like I was doing well enough to go on a solo trip with my kids to visit some family in Sweden (2 hour flight). The family were very understanding about my frequent abrupt departures from the crowd to rest in my room. Attempting the travel without my husband was a big deal for me and a bit scary. My desire to see them while I could finally won out over my fear. My oldest son is 12 and he was a big help. It went just fine.

So, overall, I weathered the travel pretty well and it didn't cause any lasting setbacks. I would recommend to be prepared well in advance so you have time to remember all the things you'll forget before you leave, assuming you have memory issues like most of us. Lists are good. I would just add one item to what Mark recommended: a sleep mask so you can block out light as well as sound on the plane. You'll most likely do fine, just be sure to plan on some recovery time after you arrive and get home. I hope you have good trips!