For a week had pain in my chest then right below then lower abdomen and back all left side. Very gassy not constipated. Also tightness in left leg.

Sounds like you are. feeling pretty uncomfortable. I can't really put that sequence of symptoms together into one specific thing going on. You have young age on your side. Intestinal gassiness suggests alterations in bowel motility (slow or altered movement of waste through tract). Chest pain for a week likely not cardiac related. Note you have anxiety...could be that. Continue to practice relaxation and work with Doc.