Your pain is due to stiffness in costo-vertebral joint. It can be unlocked by manual therapy. Good luck

It may be happen because of gastric problem also consult the general physician if he tells there is no problem consult physio and start some strengthening exercises to correct your posture

Gastric problems seems. Plenty fuids and pan 40  medicine

Considering the short history that you have provided,I would like to know where you had a previous history of lifting weights. The pain could be due to a disc prolapse but since pain is in abdomen, it may also be related to the digestive system.

Pls consult a Physiotherapist for evaluation of your back. She will prescribe you appropriate exercises and will discuss with you cause of back pain and posture correction.

Try to correct posture and use hot packs. If pain does not go consult once

In my experience, I feel that your left QL(quadratus lumborum) muscle is in spasm. It can be due to wrong posture and muscle imbalance and/or stress. If recently u hv added stress in Ur life maybe work or personal reasons...u ll hv to handle it slowly n try to reduce Ur anxiety. If it's posture related with added muscle imbalance, u ll hv to figure out what's wrong with your standing/walking/sleeping n sitting position...n try to correct them.. You can use ice pack at Ur Left low back and left buttock. Do some gluteus strengthening exercises along with deep diaphragmatic breathing exercises Avoid stretching Ur back for now...do some stretching exercises for Ur quadriceps - front of the thigh muscles

https://www.youtube.com/watch?v=HxvRQ9ZJ8vQ Chiropractic Mobilization will help. Do the cat/cow stretch. Get on all fours, with your arms straight and your hands directly under your shoulders; your knees hip-width apart.

It's may be due posture dysfunction so consult near by experience Physiotherapist