Cancer surgery symptoms and conditions

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.

I would like to know if anyone is experiencing or has experienced the following side effects:
I am 28 yrs. old and have been on levothyroxine since April 2004. I started graduate school immediately following my body scan and RAI treatment(5 days after when I was no longer radioactive) in August 2004.
After immersing myself in classes and field placement, I found myself having difficulty concentrating on my work and I had little to no motivation to get out of bed to go to class. My grades dropped and that made me even less motivated to continue on with school.
I went to my dr. and after telling him about my side effects: lack of motivation, difficulty concentrating, emotional instability, he just said that he does not believe that it is from the meds.
I have dropped out of school for the time being because I just can't get enough energy to go every day.
Has anyone ever experienced these symptoms? If so, do you believe they are an effect of the meds. or having gone through cancer , surgery, etc.?
Feel free to email me. I'd like to get some feedback. Thanks.
Amy ******