After an acid reflux about 6 month a go. I was diagnose with candida infection in esophageal and I still feel dull chest pain about few times a day.?

Need more antifungal. May still have the candida infection and may need additional anti-fungal treatment ... May need repeat endoscopy ... Taking anti-acids?
Get checked out. Candida in your esophagus is not common without some underlying problem. I assume you were treated for the candida, but you'd also want to know why you got it. You should see a primary care and/or infectious disease doctor about it, especially since you're still having some symptoms.