When the money is needed - rent, tuition, a deadline - the loss is no longer a business cost, and the effect shows up everywhere. Winners are cut early to secure something, losers are held because realising the loss is intolerable, and setups get skipped or chased depending on the week.
The size of the account is irrelevant; the relationship to the money is what matters. A trader with a small account funded from genuine surplus behaves better than one with a large account funded by borrowing.
There is no psychological technique that fixes this. The fix is structural: trade only genuinely risk capital, keep a separate runway for living costs, and reduce size until a maximum loss would be an irritation rather than an event. See financial-stress.
Related: financial-stress, hesitation, undertrading, risk-of-ruin