Since having asthma and ankle trauma in october i have trouble sleeping due to chest tightness and pain which have seen several doctors over the period but still nothing helping was fine before?

Few possibilities: Are you still taking pain medication because of the ankle trauma? Narcotic pain medication can cause respiratory problems (known as respiratory depression), especially if you are taking it regularly. Another possibility is pulmonary embolism, caused by a blood clot that travels through the blood stream into the lungs--lastly, the asthma could be exacerbated either from the stress or meds...

Rule out blood clot: Blood clots are common after leg trauma, and can travel to the lungs and cause pain and shortness of breath. It can be deadly. Tests can rule this out.

Ankle Trauma: When exactly did the problem come on with the Ankle Trauma? Was there any pulmonary function testing done? This is not something to ignore.