I have shortness of breath after climbing one flight of stairs & my feet and ankles are swollen bad for 2 weeks what's wrong with me?

Could be CHF. The above symptoms suggest chf. Though. Deconditioning due inactivity can cause sob with activity. However it will not cause peripheral edema. See an internist for evaluation. You may need echo and cxr.
See your Dr ASAP. You are retaining fluid in your lower extremities and likely your lungs as well. Need exam and testing for heart failure, kidney functioning, and other conditions. Will likely worsen over time without treatment.