You may be suffering from allergy- in this case to dust which has resulted in inflammation and swelling of the inner lining of your nasal passage. This has caused blocked nose, loss of taste sensation and difficulty in breathing while sleeping. Beside this you may also be suffering from sinusitis
causing headache. You should take antiallergics like cetrizine
, antileukotriens like monteleukast(Montair), a corticosteroid nasal spray
or fluticasone+azalastin combination for prompt relief. Take acitaminophen for headache. People with allergic diathesis(Atopy) also suffer from Br Asthma and GERD for which you may have to undergo some tests. Deep breathing exercises may help.