Having Pain And Feeling Lumps On Stomach. Could This Be Hernia?

Question : Hello I am a 36 year-old female, 5 ft. 6in., 130lbs. My only pre-existing conditions are a hiatal hernia (a 1 cm. hole of the LES) and GERD, which I regulate through diet and natural supplements. Just over 24 hours ago, I noticed while in a sitting position that when my arm touched a certain spot on the right side of my stomach, it was very sensitive. The location is about 3 inches to the right (your left), and 1 inch above my belly button, and I would say that the particularly sensitive area is no more than 1 inch in diameter. I carried on with my day today, with only a few mild reminders of its existence, when I was in certain positions or did certain movements. Realizing that the pain was still there though, and perhaps even a little more sensitive today, a little while ago I tried to press to see if I could feel any lumps. I thought that I *might* have felt a small, almost ovular or oblong lump, but couldn't be sure. I kept on pressing and feeling around the area, and eventually got to a state where my body felt suddenly weak all over, and I felt as if I might pass out. That feeling stayed with me for about 3-5 minutes before finally passing. I had no additional pain, except for the immediate pain of the area when I was pressing it. thanks