Breathing difficulty, chills, giddiness.

Dear sir, I had undergone neonatal abdominal surgery for folded intestines.Till 2019 i was absolutely fine without any problem.To remove the surgery marks i had undergone abdominal plastic surgery in January 2019.The surgeon removed the area of irregular stitches and joined the rest of my stomach by pulling it closer.From the onwards iam facing breathing difficulties,chills,giddiness,unable to open my mouth to swallow air.All this happens only when i eat full. If i dont eat full nothing happens. I have consulted a gastroenterologist but he said after doing all tests that i have nothing and was just getting an anxiety attack.But it is not like that.When i eat full all these problems start on their own after 10-15 min even when iam cracking jokes.They start on their own. Kindly help me as no one is understanding my problem.Thankyou