Thank you for your kind note. Yes, I think it is safest for you to avoid the second dose. To be perfectly safe, you might consider getting a blood antibody level measured. If you have IgG you are highly likely to be immune and safe.
I think the elderly and frail with prior infection will be far more susceptible to a vaccine triggered complication, because they will have a harder time tolerating the inflammatory sequelae. But, as the case of Dr. J. Barton Williams of Memphis, TN clearly indicates, some younger people will also be susceptible.
All my best,
Hooman.