Breathing problems and Chest Pain.

I have trouble breathing when lying in back(feeling as air stuck in throat)..then if I sit up and do breathing exercises it becomes normal..This has been going for around 8-10 days..I also feel Nausea and vomiting tendency and have sweating (going on around 5-7 days)..I don't have a fever or continuous cough( though I do cough continuously for 1-2 hr).. I had trouble breathing at night so I went to check with doctor from emergency ward.. They checked my bp and breathing pulse and body temp.. Bp 150/90.. and gave me Razo-D,Montair le and cough syrup and Betadine.. I came back home and then the breathing problems still exist when lying down..and also having chest pain and lethargy type feeling.. Is it a serious issue..and can u suggest some home remedy..and when should I visit a doctor?? I am still having breathing problems (it's less than before) and mild chest pain..should I watch 1-2 days and then go if problem still exist..