When I stop and let others go through a doorway before me, especially when it is a family group, I'm not expecting to be summoned to the palace to collect a medal, I don't even necessarily need a 'thank-you' but I do expect some form of polite acknowledgement. Just a smile would do. I'm not invisible but apparently I am to many. Gits.
If you use the search function I'm pretty sure you'll find plenty of previous threads on gf with lots of good advice. So few people on here now that you may not get much of a response. Having said that, chances are it will be just plenty of rest and don't try to come back too soon. Hope you feel better soon.