Hi dear, u have got respiratory infection. Dryness of mouth must be due to the medications you are on. Have you got your BP checked? Since when do you have giddiness?
Next Steps
You should be starting on an antibiotic course and a cough syrup. Hope you are performing certain physical exercises on a daily basis.
Health Tips
Increase your intake of water, preferably hot water. Take lots of fresh fruits and raw vegetables too. Please do consult here for further assistance