Thanks for your question on Healthcare Magic. I can understand your concern. You were having blunt chest injury last night. This kind of injuries mostly cause musculoskeletal pain. But when severe, they can cause lung injury like pulmonary contusion, pneumothorax etc. And they can cause breathlessness. So better to get done chest x ray to rule rule out lung injury. If chest x ray is normal then no need to worry for major lung complications. Simple musculoskeletal pain is the cause for your symptoms. So avoid movements causing pain. Avoid bad postures in sleep. Avoid heavyweight lifting and strenuous exercise. Take ibuprofen tablet. Apply warm water pad on affected areas. Don t worry, you will be alright with all these. Don t worry about collapse lung or other severe complications. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.