Left side neck, shoulder sciatica pain.

I have consulted  neurologist for continous pain from neck,shoulder and back of thigh radiating to front side even upto stomach from chest.MRI,RA spine screening tests,haemoglobin,ckt blood tests has been done.tests were completly normal except haemoglobin whic is 8percmt but I was prescribed with Ultracet semi,Petril Beta 10 and pantasol dsr.I have been using these since a week but my shoulder pain was not cured.A doubt bugging in my mind is I fouund on google that there are severe side effects of drug contents in my prescribed medicines..Doctor, I request you to clear my doubt..I found that ultracetsemi+petril drug interactions are severe..Amd also where can I find treatmnr for my shoulder pain..pain is radiating around armpits my nerves are paiming sharp