Hi , I Am A 29 Years Old Woman. Lately,

Hi , I am a 29 years old woman. Lately, for around 3 months, I have been feeling left side pain in the lower part of my abdomen, bloating and irregular bowels. The pain doesn't go. At night and in the morning , it is the strongest. My doc is suspecting irritable bowel syndrome and prescribed for me tests and verine pills three times a day. It has been five days since I am taking the pills, no improvement. What to do? And is it ok to do blood test while taking this medication? Thank you