Hi thanks for asking question.
You are having mostly acute viral infection of
respiratory tract or
pharyngitis.
Because of
sore throat and as it is infection nausea can occur.
Your total count is 1,900 which is low , it can occur in acute infection.Treat your infection symptomatically.
Like decongestive treatment for relief from congestion.Like antihistaminic or for blocked nose
oxymetazoline nasal drops.
Steam inhalation good.
For few days avoid spicy and fatty food minimum.
Drink more water with fruit juice.
Onion , garlic good for respiratory tract, included in diet.
You had heart burning and heaviness could be by gastric problem like acidity or simple stomatitis , take
omeprazole for that.
If your symptoms increasing then chest x ray done to look for consolidation if fever present.
If abdominal right side pain present do your Liver function test to rule out early hepatitis like condition.
Wish you good health....
Take care