Hi David
That seems a long time to have pneumonia, was you on antibiotics all that time ?, still having pneumonia which of course you didn't know and having the flue & pneumonia shots must have had been just far to much for your system to handle, all at the same time.
I believe its a good idea to try to protect yourself against the flue every year and especially when your getting older, a shot for pneumonia is wize.

I get an influenza shot every year these days,and take lots of vitamin C, after an episode of having the flue and being asmathic i got a hell of scare when i couldn't breath properly one year, dame awfull, so i haven't missed a shot in about 8 years and thank god i have not had the flue since.
Sometimes i get what feels like the start to a flue but only lasts a day or so then goes away.
I didn't know about the RSD connection and i didn't know about the shingles shot, my uncle been going through hell for the last 5 years because of dame shingles.