Assuming there was no trauma to your chest, this could be one of many things. I don't know if the pain is sharp or dull, but this could be pericarditis, which is an inflammation of the lining of the heart. This could be caused by a viral or bacterial infection, or trauma even slight, to the chest wall. Drugs can also cause this entity. I don't know what meds you take, but these should be checked. Pericardial pain is often sharp, getting worse with deep inspiration. It can radiate to the jaw and shoulder. With acute pericarditis there are usually ekg changes, however these may be absent. Aspirin, adult dose, usually helps the pain. The definitive treatment is colchicine tablets. You could also have chest wall pain, which can be caused by your asthma, or any pulmonary issue, as well as, trauma to the chest. Anti-inflammatory drugs usually help the pain, which is usually sharp in nature and localized to the area under the breast going toward the axillary area. The pain gets worse with movement. Muscle pain usually from strain, from coughing or trouble breathing, may also cause this pain. Using cold and heat packs might help. I'm not sure what the weakness in the extremities is from without examining you, however, some routine blood work might help. You could get a complete blood count, Sed rate, Cardiac enzymes, CMP. to start. A complete physical exam is indicated. There are other Rheumatic conditions like PMR, which need to be ruled out as well.