What is causing my persistent chest pain and phlegm?

White or clear phlegm without cough and breathing problem for about a year, mild right chest pain for about seven months. Sometimes its like a sore throat.Weakness is felt from within.A chest x-ray was done but nothing was detected.Several red rashes appear on the chest But I am very worried about the problem.What can I do for this or any disease symptoms?It would be great if I could know. 1.amoxyclav 625 mg2.levocetirizine 5 mg3.montelukast 10 mg 4.tab (ap) Aceclofenac Paracetamol) Pantoprazole (40mg) T. Azithromycin (500) Sup Ascoril LS 1 . Lavocet T. Montelukast /10) Itab T. Mucinac (600) Itab 7. Pan (40) I T. Boufen (4oo) Itab sos Tab. AB Phylline 100 BD Completed all those medicine. Now i feel sharp right chest and back pain with frothy white phelgum.