Chest pain?? Help!

So I’m prone to chest pain. It usually aches on my left side and shoots to my arm like and I already went to my doctor for that. She says it’s stress and that I’m fine and need to stress less. So I have been stressing less and I’m fine. But right now I have chest pains that are different from the stress pains. It’s happening in the are of shaded blue in the picture. Any clue what it could be? I walk a lot and my jobs has me walking and standing and lifting a lot. I ate healthy today, drank a lot of water and had no caffeine. I’m not stressed. I am a little gassy and I have a slight headache. Any thoughts would be appreciated. I’m 19 if age makes a difference. It’s a shooting pain and when I breathe in deeply it shoots worse.