Psalm 38 is a psalm of lament, where the speaker is deeply distressed by his suffering and feels utterly overwhelmed. Verse 17, "For I am ready to fall. My pain is continually before me," expresses this feeling of impending collapse and the constant presence of his agony. Let's break it down:

"For I am ready to fall." This isn't necessarily a literal physical fall, although that could be implied. More likely, it speaks to a feeling of:
Imminent Breakdown: He's on the verge of giving up, both physically and emotionally. He feels like he's about to collapse under the weight of his burdens.
Spiritual Weakness: He may feel spiritually vulnerable, as if he's about to succumb to sin or despair.
Loss of Stability: His life feels unstable and precarious. He lacks the strength or support to keep standing firm.

"My pain is continually before me." This signifies:
Unrelenting Suffering: The pain is constant and doesn't let up. It's always at the forefront of his mind.
Obsessive Focus: The pain consumes his thoughts and prevents him from finding peace or perspective.
A Reminder of His Condition: The pain serves as a constant reminder of his illness (physical or spiritual), his guilt, or whatever the source of his suffering might be.

In essence, this verse paints a picture of a person who feels completely worn down by relentless suffering. They are on the edge of total collapse, both emotionally and spiritually, and their pain is a constant, overwhelming presence that they cannot escape.

Context is Key: To fully understand this verse, it's important to read it within the context of the entire psalm. Psalm 38 is a prayer for mercy and healing. The psalmist is acknowledging his sin and pleading with God to deliver him from his suffering. He's not just expressing his despair; he's using it as a means to cry out to God for help. The verses before and after further illustrate the specific nature of his suffering (often linked to sin and the consequences thereof).