Back in the day, before I knew I had MS and didnt know what an MS hug was, my gall bladder area HURT! it was like someone grabbed that muscle where my diaphram is, and flipped it over. it was a tugging, and yanking sensation. it got painful. Just on the right side. My MD did many blood tests, and we couldnt figure it out. After scans, and exams, we decided to go look. He did key hole surgery to go look, and saw nothing wrong, but since my family has such a severe gallbladder history, he removed it, and hoped that would fix my problem. it didnt.
Long story short, and many years later, I still get that tugging, muscle flipped over sensation right where my gallbladder/liver would be. Learning about MS has taught me that its the MS hug, and wont kill me. I have learned to stretch, and massage the area to help it.
Mine still happens when I lay down at night, or sometimes when I have overdone my day with active stuff. it comes and it goes. Some days nothing, and then for 3 days running, i get that tugging. then a week of nothing. bizarre. Im glad I finally got it figure out, i used to worry that I was sick, and my liver was gonna rip open or explode or bleed, and no one was gonna figure it out in time. (ok, anxiety is a sx for me too.)
As long as your blood work remains clean, its probably not an organ messing up, its probably that diaphram muscle not being happy. Suggest that to your MD.
I hope you feel better.