Postherpetic Neuralgia Treatment

My mother had chickenpox long ago. Then she had pneumonia and encephalitis a year after that. Encephalitis was really bad, she could not speak and write for a year and she had a brain necrosis. Our health system is very bad. Fortunately, my aunt had the money to buy a treatment and she has only a slight speech problem - speak more slowly, a few bloopers. But she is fit to work and his trial and circulation are normal. After 7 years, she had necrosis on the head of his femur, she did the surgery ... But that's another story, it happened hydrocortisone, when she is sick.
I had chickenpox when I was in elementary school, then about 4-5 years later (can not remember) that I had Shingles. Fortunately I did not experience post-herpetic neuralgia then until now (I'm 21).
Does this mean that we certainly have a genetic immune deficiency? Or is it not a rule? Should I get tested to know?
If we do, what other complications can we experience?
PS I also had a really bad case of laryngitis at the time, for 2 weeks or more, when I choke all the time, stay in bed with a wet cloth to the window, but I am not sure that is relevant.

It is possible, and there are genetic disorders of the immune system, but it is something that should be tested. However, this is not an automatic diagnosis, and there are other factors that could cause a predisposition to infections, such as those you mention. Herpes zoster (shingles assume you mean) at a young age is unusual, but if I ask a follow up with the issue.