Hi, welcome to the forum, Your symptoms are suggestive of allergic rhinitis which is exaggerated or precipitated during cold season or timing. This condition is sometimes associated with asthma.
The triggering factors like dust, fog, pollens etc. can cause the precipitation of these symptoms. A careful nasal examination, Allergen-specific testing includes Skin testing, Serum tests for allergy, Allergen challenge and as well as Evaluation for concurrent conditions like Sinusitis and Asthma is necessary and it directs further steps for management. You need to avoid the exposure by covering nose with a cloth, whenever you are exposed to allergen like dust.
Now as far as medication are concerned. Avoid anti histaminics like terfenadine and astemizole, which is associated with heart problems and may worsen existing arrythmias. Drugs like loratadine, cetirizine, and fexofenadine are not associated with rhythm changes and safely can be used but against prescription. I suggest you to consult ENT specialist and cardio physician. Take care and regards.
I also posted my allergy concern on the Heart Rhythm Forum as I was also looking for inputs on the possible interactions of nasal medications on my atrial fibrillation heart condition.
I found the help obtained there to valuable, so I copy the link to that information below for anyone on this forum interesting in this subject.
http://www.medhelp.org/posts/Heart-Rhythm/Allergy-time--what-to-do-about-nasal-congestion/show/1514436