Dear sir/madam, i think that your symtpoms are caused by dispepsia. it means that you heave some stomach disorder and most common are gastritis, GERD and hiatal hernia. Your symptoms ate typical for these disorders beacuse eating causes bloated stomach which irritate phrenic nerve( causes shoulder pain especially when you take a deep breath. So you should do gastroscopy and stomach biopsy first to rule out diseases i ve mentioned. For treatment try to change your diet, avoid alcohol, coffee and spicy food, also lose some weight, it might be helpful. You should ask your GP about taking some anti acid medicines such as pantoprazole or antacides. Wish you good health, DR Ivan Romich