your suffering from deviated nasal septum
.dns ia very common. not all of them get symptoms from Dns but
if DNS is severe it cause nasal blockage,sinusitis(running nose),epistaxis(nose bleeding) and infection.
blocked nose will lead to improper circulation of oxygen
in the body which may be the cause of weak memory.
daily steam inhalation and yoga will help you maximum.
drink plenty of water
avoid exposure to cold
if at all the condition remains same than you can consult good homeopath
.and you need to take long course for it as it may not give you permanent releif within months or two.