Right upper abdominal pain, under rib cage when walking for the past 3 months. After recent flight feel pain also at night spreading to back. Concerns?

Biliary colic. You may have gall bladder disease, i.e. Stones. A frequent symptom is being awakened at night with RUQ pain and radiation around o the back, caused by a stone rolling into the neck of the gall bladder and obstructing the cystic duct. An ultrasound of the gall bladder should be done to diagnose this.
Yes,for ignoring. No reason to suffer, you have to be concerned for ignoring your pain for 3 months , time to see your doctor for exam & investigation. Most likely you have symptomatic cholecystitis with gall stones , you will know it and get rid of your pain soon .