I'm in a similar position and have developed quite a thick skin about nasty comments and snarky remarks coming my way. Bring medical paperwork, doctor's letters and carry multiple copies in case they get lost or need to be filed and be prepared to show them to airline personnel if challenged.

It still bothers me when some people are outwardly nasty or accuse me of "pretending" note or not but that's just the way it is. Also be prepared to get shoved out of the way by the elderly who think you're encroaching on their "turf" There are also some weirdos around that want to know the where and whys of your situation so be prepared for that too (ignore or have the short version of your story).

Call in advance for the wheelchair and remind them at check-in. Do not leave the plane until they bring you your wheelchair.