Left side chest pain due to gallbladder/GERD or weak sphincter?

Hello All, I have been going through the forum posts here to see if anyone who had left chest pain due to bad gallbladder, and if there was someone, did it help after getting gallbladder removed.

I have been having almost constant chest pain on the left side only (mainly around mid-chest on left side) and sometimes at lower end of sternum on left side for last two months. I also have episodes of nausea and/or dizziness sometimes. I have been to ER thinking it was my heart and then through series of tests - EKG's, Stress test, blood tests, HIDA scan, ultrasound, endoscopy. Almost all tests were normal except ultrasound where they saw gallstones. Endoscopy confirmed redness little inflammation of esophagus and stomach - confirming GERD - which I have been fighting for a long time now. I am taking Omerapazole twice daily but it doesn't seem to help with the chest pain at all.

I have met my primary physician and GI. My primary physician has told me he thinks this is costochondritis causing the chest pain, and my anxiety(I agree I have been way too much worried and irritated last 2-3 months due to chest pain) or reflux for nausea. My GI tends to agree; they are not totally sold on gallbladder being root cause of chest pain mainly because I don't have any pain on the right chest or abdomen area, it is only on the left side. However, my GI asked me to get another ultrasound and is going to monitor me and have said depending on how I feel in a month or two removing gallbladder is an option - only risk with this is if gallbladder isn't causing me the chest pain right now, I may have chest pain even after gallbladder is removed.

I am hoping someone can share their experience, if they had left chest pain due to gallbladder, and how/what they did to help them. Also, I have been reading that GERD/weak sphincter (both of which I have) can cause chest Pain - and what can be done about it?