**Core Concept:**
The patient is presenting with epigastric pain radiating to the back, relieved by food intake and associated with past history of perforated duodenal ulcers. The symptoms and surgical history suggest a condition known as post-perforation pain.

**Why the Correct Answer is Right:**
Post-perforation pain is a type of pain that occurs after a perforated peptic ulcer has been repaired surgically, typically using an omental patch. The pain is typically described as epigastric or epigastric-radiating to the back, and is relieved by consuming food. The use of proton pump inhibitors (PPIs) and analgesics for pain control is also consistent with this diagnosis.

**Why Each Wrong Option is Incorrect:**
A. Correct diagnosis (post-perforation pain) does not match the patient's symptoms and history.
B. This option is incorrect because pain due to peptic ulcer disease (PUD) would not be relieved by food intake.
C. This option is incorrect as post-operative pain typically occurs after the surgery, not as a presenting symptom.
D. This option is incorrect as it does not explain the pain relief with food intake and does not match the surgical history.

**Why the patient presents with pain:**
The patient presents with pain due to the surgical intervention, specifically the omental patch repair used to treat the perforated duodenal ulcer. The relief of pain with food intake is likely due to the distension of the stomach by food, which helps to cover the surgical site and reduce the irritation caused by the pressure on the surgical site.

**Clinical Pearl:**
It is important to consider post-perforation pain in patients with a history of peptic ulcer disease presenting with pain that is relieved by food intake and controlled with PPIs and analgesics. This diagnosis should be considered when assessing patients with similar symptoms after previous surgical interventions for peptic ulcer disease.