Welcome in H.C.M.
I read your query and analyse your clinical history about cough and congestion over chest and severe pain
Your cough is most likely because of bronchospasm
and congestion. Here I would suggest you to take-
(b) Cough syrup having bronchodilator
, mucolytic and expectorant.
(c) Warm saline gargling.
I hope above treatment will give you relief in cough. Since you are worried about liver so it will be wise step to cosult your doctor as follow up visit of liver transplant