Years ago, When De Linda Brady was suffering from seemingly endless respiratory issues, she never would have guessed that her ailments would one day lead to her life’s passion. Asthma, bronchitis, allergies, a sinus infection that led to surgery — Brady felt sentenced to a life of discomfort, and it didn’t help that her physician told her she’d better “learn to live with it.” To make matters worse, Brady — then a Bay Area secretary — began to experience severe back and neck pain. “I had years of night terrors because I thought it would last forever,” she said. “Sometimes …