Abdominal pain on lower right side. Leg!

I faced lower abdominal pain right side during excercise a year ago. It didn't go away after a few days of rest, so I ended up doing some physio. after no luck I visited an ortho. First, it was suspected as hernia, but the USG came clean and he can't help me. I went to another ortho doc, but he said go to a third doctor who is a sports injury specialist and a senior in experience. He suspected I might have a muscle tear in abdomen. So, we did another USG for abdominal wall, but since it came clean, he asked me to do an MRI, and to my shock, the MRI also came clean. The doctor gave me pain killers for few days, and said to start excercise gradually, since there's nothing in the scans, we've nothing to worry. I did almost no workout/ light yoga / occasional walks after that for next 1 year and the pain went away. Now, I started strength training since a week with low intensity but  the pain is back. guide me where to consult now. lower abdomen right side,a bit of pain radiating to leg