I think i may have strain the diaphragm muscles at the gym (due to the symptoms am experiencing - did research), and am now having breathing difficulties, and the doctors think it's mild asthma, however, the asthma medications makes no different.

Need to examine: It is not feasible to provide a meaningful opinion without examining you. However, it is highly unlikely that you injured your diaphragm. You may wish to get a second opinion from a pulmonary medicine specialist. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.