Stomach pain before motion & farting gas

I am 26 years old woman from Hyderabad I am unmarried and It's difficult for me to find out reason for pain in middle and around stomach area and leads to motion and sometimes I feel ease when gas ( fart) is out. Previous month I had done test for ultrasound usg and pelvis suggested by gynaecologist for irregular periods. In that test I found that theirs " hyperechoic lesions in the liver likely Hepatic hemangiomas"and also mild signs of pcod in right overy. So where is cause for my stomach pain ? Is it lesions in stomach is a reason ?  Or Is it delay for periods ? Is it tablets I used divery 10 mg and Diane 35 10 days back which are (Only prescribed by gynaecologist ) for irregular periods. Kindly Please Any doctor please tell me reason.