I Am A 65 Year Old Woman. I Am Experiencing

I am a 65 year old woman. I am experiencing a pulsating feeling behind both knees when lying down . In the past couple of months my blood pressure has dropped considerably. I have been hypertensive for many years and now my at rest blood pressure is 100/62 and after a 3km walk and climbing a flight of stairs it is about 126/ 75. I am also having difficulty controlling my weight and despite eating considerably less I am slowly putting on weight.