Sounds like a veyr successful experience. My colon felt a tad, just a tad, tired/tender after I had a colonic, after the flush -- but that's because so much came out. It was like a huge workout.
Just rest. It'll be fine. Your liver is under your ribs mainly on the right. Your stomach is on the other side. Below all that are the large and small intestine. I really think it's your colon feeling tender from processing all that stuff. At least this was my experience.
Otherwise, I felt/feel magnificent. My liver feels happy.And my skin is getting better every day.