Unable to Lift Right Foot to the Height of Bed

Dear Sir

For about two weeks I have been unable to lift my Right foot+leg up to the height of bed. This means that somebody else has to lift my foot and keep it on the bed and then only I can lie down. I cannot lie myself on the bed.

For about two years, I am unable to lift my left foot+leg up to the height of the car too. It also means the same thing - that somebody has to lift my leg and put it in the car.

Please suggest something.

1. I am obese.
2. I am diabetic - under control
3, I have swelling on my whole body, My both the blood and urine reports are normal.
4. I have osteoarthritis in my both knees for about 15 years. Now I am handicapped for the last 5 years.

With regards
Sushma