It seems that you are having allergic bronchitis
giving dry irritating cough
and stuffy nose.
Take cough suppressant syrup for few days.
There might be possibility of having bacterial infection as well so go for one antibiotic medicine course.
Take some B.complex, folic acid tablet
for your sore tongue.
It is advisable to prevent your pregnant friend as there are all chances of getting infection to her.
drinks, fried and junk food.
Ok and take care.
Do warm water gargles.