sinusit ,allergey ,low blood pressure

Iam 22 years old.History:Iam cold type person,I passed some chronic cold,also I have allergy with smells,dust and cold weather, for these I am sneezing since from 13 year old when I changed my country from hot weather country to cold weather.Now Iam in other cold country more than my home country colder.which has six months snowing.I have found myself so cold and fluffy nose with thick yellow.I don't have pain in face but Iam feeling itchiness in nose every time when it became dry then watery then fluffy.by touching nose I feel to itch harshly,itching also in my eyes,moreover I took glasses,for not seeing far and blurry.one thing more I have low blood pressure and my blood cells are not enough because I have pain in my upper part of stomach.it caused me to lose blood every time.when I sit more than 10 minutes my nose became fluffy and I feel dizziness and low bp.I eat 2 times a day.I don't have appetites well.my stomach is not working properly,I found belly fat.now I cant breath in dry and cold weather of here just in taking hot bath I feel opened my head,when Iam thinking and sitting , working in one place about 30 min I feel all below low bp dizziness fluffy nose. what is my real sickness? allergy, low bp, less blood cells, or chronic sinusitis.