Hi Rashmi N
Welcome to healthcareMagic.
Firstly get your cold
treated by taking an antihistaminic like levoceterizine , repeated steam inhalations , vitamin c
tabs with your Doctor prescription.
Secondly , change in memory needs to be attended by your Psychiatrist
.There are chances of decrease in memory due to long term use of anti epileptics and the disease itself.Or it could be due to vitamin deficiency
also.I advise you to visit your Psychiatrist and get evaluated for the type of memory reduction , cause and treatment.