For A Few Weeks, Painless Feeling Of Mild Tightness /

For a few weeks, painless feeling of mild tightness / heavyness in lower abdomen. No other symptoms, no pain, normal bowel movement, no visible bloating or distention, Eased when sitting or holding my belly fat, stretching helps and often a little gas. I sit quite a lot for work, and I think my posture isnt perfect. 41 year old healthy male. Work medical last April showed no issues in blood. Suffer from anxiety a little too. After standing slowly creeps back in. No worsening over weeks, but had same several years back when starting new job (sitting again) 3 times a week gym and currently whole30 diet period almost over.