Suggest Treatment For Swollen And Painful Knee

I am 73 years old and today I was in the kitchen when suddenly my hand slammed against the counter involuntarily and my knees started buckling and then I would bounce back up and then buckle again. There were jerking movements of my arms and my knees. I finally hit the floor but never went unconscious. This also happened to me about a year and a half ago when I was going through chemo. I have had two mild strokes(TIA's) but not in the last 2 years. My doctor has me on meds to control my blood pressure. I also have an AAA. I am reading that this may be a seizure.