Allow me to put in my two cents? First of all - PLEASE don't stress it. Take a deep breath and Rest assured that all will be well. Worrying about it NEVER fixes anything and only puts your colon in knots. Plus I would avoid getting designated as a special needs traveler. You don't know what that can lead to. Try to get your assigned seats when you do the 24 hour on line check in. Get to the airport early and they should be able to accommodate. I know things have been crazy with the airlines but it is a reasonable request and I have seen flight attendants really try to help. I have been fortunate in that I rarely have such problems. Occasionally, I have ended up in the very same "premium" seat that they had offered to sell me for a higher price.

Sending you good vibes and blessings for a safe and happy trip!