Claire lost weight thanks to the support and encouragement of her
friends. They helped her stick to a healthy diet and pushed her to
engage in physical exercise every day. Identify the factor that helped her lose weight.
- social environment
I don't believe dyslexia is a born disorder, and can be developed at any stage of life, given the circumstances leading to the development. It doesn't occur out of the blue, there is always a reason for the development of a learning disorder. I would not jump to the conclusion that you have dyslexia, though. It is simply a possibility. Other reasons your reading and writing could be affected includes lack of sleep, hormone rampages, environmental changes, etc. etc.
Zygote!
extra characters so I can answer your question...