I think its your right to ask for the nurses that had flu shot and I also think you should say something about the comments she made. Unless asked, she really should keep that opinion to herself. I am surprised to hear that she would be so outspoken. In our hospital, if 80% of the hospital staff receives a flu shot, everyone gets 4 hours off so that encourages a lot of participation. I always get one and will continue to do so, I do believe they help.
I think next time your uncle brings up nursing home issue for your aunt, you should at least ask why and tell him that you take much better care of her than any (even most expansive) nursing home will. I don't think there are "free" nursing homes, at least something will need to come out of his pocket but from it sounds, he won't be able to afford a nice and expansive nursing home. This is something that you will need to take one day at a time, maybe it won't happen. You always need to stay positive :)
In terms of your symptoms, vertigo, which is what you are having, doesn't always come from middle ear problems, sometimes it just occurs from no specific reason at all. But if you have chronic sinusitis and allergies, vertigo can definitely be associated with them.
Meclizine, unfortunately, does not cure vertigo, it only improves symptoms once they are present. Some people can take Meclizine only as needed when episodes occur and other people need to take Meclizine every day because without Meclizine they have recurrence in symptoms. But Meclizine does not clear up inner ear issues.
There is no danger to take full tablet of Meclizine or 1/2 tablet two to three times daily when you have the symptoms. They only problem is that Meclizine can make you sleepy but if it doesn't, no problems taking it more often. If you take Meclizine at bedtime, you should take a full tablet.