Darvocet A500 and naproxen

I am 51 years old i have been taking this medication for over 20 years. I was taking 2 pills a day which was helping me a quite a bit. My son was just born when i started and he is now going to be 20 years old. I have servere arthritis on my knees and i need to have knee replacement on both knees. No im taking this darvocet 4 or sometimes 5 a day and it really helps me to stay on my feet. I cannot stand on my feet for over 10 minutes i'm in pain and i want to cry. I am on disability and this pill has help me to much . It also gives me energy makes me want to be on my feet cleaning and also helps me with my sex drive. I want to be with a man for a longer period of time, and yes i feel a little sleepy so i rest when i want to , i can take a nap at least twice if i want too. If i want to stay up all day i do its all a mind thing. It does give me a little stomach pain if i take it with a empty stomach, other wise it really helps me . I will take this medication for as long as i have to because i do not want to have surgery on my knees. I also have back pain but i feel fine when i take my medication. I also take naproxen 500 mg and lisinipril 20mg all in total i take 5 different medications twice a day. But i will not stop taking my darvocet because without it i feel weak, i cannot move without feeling pain all over. I feel like im 80- years old when im not taking my pills, but i feel like im 30 years old when i taking this medication it really makes me feel energetic , happy , very good sex drives and i can live with this forever. Hope this will help someone, who is confused, about this drug. I have 6 sisters with the same problems knee problems and my mother who is 68 years old and she also takes this for pain.