I have been doing exercise and walk every day for 1 hour and cricket during weekends. Last week I suddenly started having heavy breathing during the cricket game. It occurred after an hour of game but suddenly started reoccurring after every few minutes. As if not having a lot of breath. This is the second such occurrence. Last time when it happened, I visited my family physician. He doubted about acidity. Later after the test we found vitamin D and B12 were very low. Had then injections for both and medicines too for both. This episode happens 3-4 months back. Please suggest proper diagnosis and medications.