I Am A Retired RN Due To Disability---sleep Apnea But

I am a retired RN due to disability---sleep apnea but driving now and ok. I am probably going to need to have a (R) total knee replacement due to osteoarthritis. However the last several months both of my feet and lower legs have 3-4 pitting edema. I have a long history of Lasix 40 mg with potassium daily. I have been having a cardiac and pulmonary work up but had a CT of chest and found a liver nodule 4.7+5.3+3.7. I have an order for liver enzymes and possible MRI of the liver. Also I have a history of brain meningioma of > 2.2 cc. Shortly after that I had breast CA and had a lumpectomy and radiation.