I have a dry cough and feel very week?

Cough with weakness. There are many causes of dry cough, and at least 12 that could cause both weakness and dry cough together. As it is the season of RSV and influenza, as well as pertussis etc get checked for a treatable infection first. As you are 32 years old the other potential causes are less likely, but serious. Let your doctor know how long you've been feeling poorly, and any other associated symptoms.