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Hi Archana, You may be having allergic rhinitis
which can cause constant cold and tiredness
and headache. You need to get examined by an ENT Surgeon to know the proper picture as to what you are suffering from. I would recommend that you exercise everyday by brisk walking for 40 minutes as this helps a lot in allergies. Eat fresh fruits and vegetables everyday for good antioxidant effect. Also do Yoga, Pranayam and deep breathing exercise
for reducing stress for the day. You can take over the counter antihistamine tablet like Cetrizine
at night for cold for some relief till you show ENT Doctor.