Confidence is useful and it does not extend the limits of tissue. You can persuade yourself past a boundary for a while, sometimes a long while, and the body keeps its own account and eventually presents it. Belief affects what you attempt, not what you can sustain.

Where you have been overriding a physical signal for months, stop arguing with it and get it assessed. Determination is worth a lot. It is not worth ignoring something that will not negotiate.