I can understand your concern for your problems. You are suffering from congestion hope you have visited a doctor and been treated. Cough
can be due to weather change. Mucolytics can be of much help to you but do not take overdoses. It will worsen the symptoms.
You also have chronic problem of gastritis
. You should avoid constipation
to get rid of it. You need to make dietary changes. Take fresh green veggies, fruits that are rich in fiber. They will help to keep your bowels clean. Improve your toilet habits. Take plenty of pure hygienic water, soups and juices. You can consult a doctor and take laxatives and antacids. Follow the dosage strictly as prescribed.
Sometimes chest tightness
can also be due to some changes in the heart. To be on the safe side have an ECG done to rule out any heart ailment. Keep your living room fresh and airy. Have a good day. Take care.