The scratchy/tickly throat could be from postnasal drip or asthma. The achy chest and shortness of breath are most likely due to anxiety. To find out for sure you should have a chest x-ray and a breathing test called spirometry done. Spirometry is a simple breathing test that measures how your lungs are working. It will show if there is obstruction in your airways. Often it will identify a problem in your lungs before you have symptoms. When this is done periodically it will tell about the health of your lungs over time.
It is very unlikely that, given your age difference, you should also have idiopathic pulmonary fibrosis (IPF).