Hi welcome to the health care magic Coughing with change in voice suggest toward Laryngitis like infective condition... It might be secondary to upper respiratory tract infection... Here if congestion more than short term steroid course like betamethasone for five days prescribed.... For dry cough dextromethorphan syrup prescribed Drink hot water for drinking... Avoid excess spicy foods and fatty meals Throat swab and chest x ray can be done for further work up Empirical suitable antibiotic course given if needed Your Auscultation and CBC will also decide your further course of action Take turmeric powder with hit milk daily Take care Consult physician or otorhinolaryngologist for examination