I experience severe breathlessness when I walk a bit. What could be the cause?

Hello doctor,

It started with loose motions 15 days ago and a slight fever for a few minutes, followed by severe sweating. Loose motions were controlled with some medications. After five days, suddenly, I had whole-body flushing where the whole body felt hot from inside. It started from the head, cheeks, and nose. I observed that the nose became very stiff. I have undergone tests for CBC, urine routine, ESR, urine culture, typhoid, vitamin B12 deficiency, and chest X-ray, and everything looks normal. The physician, after a consultation, said that it could be due to pressure and suggested taking Lorazepam MD when the flushing attack happens and suggested to take Nexito Plus for a month. I had aerophobia and a few other phobias which I have experienced in the last two months, for your information. Also, I have a history of sleeplessness and have been taking anti-depressants for some time. My other complaints are full body weakness, dizziness, breathing shortness, chest discomfort on walking for long, eye pain, and tremors. There is no significant weight loss. I had allergic rhinitis and experienced a cycle of it in the last two months. Please suggest what is happening.

Hello doctor,

Thanks for the reply. I experience severe breathlessness when I walk a bit, and most of the time, I feel weak. I am a smoker, though I stopped the last week. Once I tried to smoke, I felt all the symptoms that I have explained doubled.