I've been having cold, cough, and breathing problems, especially at night and in the early morning, for the past three weeks. I consulted a general physician and took medicine for a week. The breathing issue goes away while on the medicine, but it starts again once I stop. Can you advise me on what to do?

It sounds like you may have asthma or an allergic airway condition triggered by cold or night-time air. I recommend consulting a pulmonologist for a proper evaluation, including spirometry. Continuing appropriate long-term treatment, like inhalers, may help prevent recurrence.