I am 36 weeks pregnant. Sudden swelling of feet and hands. Bp is 128/86. All normal pregnancy symptoms at this stage?

More than likely. More than likely swelling of feet and hands is a normal sign of the third trimester. However, if you develop a severe headache, severe pain in your right upper abdomen, or start having spots in your vision that are new, you should immediately be seen by your obgyn.
Fluid retention . You are having fluid retention which is not unusual at your stage of pregnancy. Try cutting down on your salt intake. If that doesn't help see your OB as you may need a diuretic .