Thanks for your question on Health Care Magic. I can understand your situation and problem. In my opinion, you might have contacted infection through your co worker. Severe cough, chest pain, rumbling sound from the chest etc are suggestive of lower respiratory tract infection (LRTI). So better to get done chest x ray and clinical examination of respiratory system to rule out LRTI. You will improve by antibiotic, anti inflammatory, mucolytic, expectorant drugs. These drugs will dilute the secretions and make them easy to cough out. Also take pneumococcal and Influenza vaccines to prevent such lung infection. Don t worry, you will be alright. Hope I have solved your query. Wish you good health. Thanks.