@uzairkashtwari92- Welcome to Connect from your new country! By the sound of this, things seem pretty desperate to you. You must have been scared when you took a deep breath and found that the air didn't seem to be there for you. When you move to a different country the air, temperate, ecosystem, foods, smells and so forth changes. You might just be allergic to something there. On the other hand to rule out something more serious I would like to suggest seeing a doctor. I encourage you to read as many of these posts to see what might jog your memory as to the cause or for a solution. If you slow your breathing down, walk slower, inhale through your nose and exhale through your mouth slowly you can gain control so that you don't run out of breath and panic. And panic is what happens when you can't breathe, so it's very important to practice this, a lot! This happened to me when I was getting off a plane and I held up a whole line of people. I had a bronchial spasm.
Do you have a cough or fever? There is a very bad virus going around.