Ultracet and liver

I've taken Ultracet for about 4 years almost every day, morning and night time and sometimes in the afternoon depending how severe my pain is. I take 2 pills each time. It does help take the edge off my pain. My doctor said my Fibromyalgia is as bad as it can get, plus I have severe arthritis through my whole body. I can hardly stand up straight and trouble walking. Ultracet seems to help better then Ultram for me. I'm concerned about how long I've taken Ultracet and damaging my liver or other organs. Does anyone know how long you can continue using Ultracet before it does damage. I'm very concerned about that issue because it does somewhat help with pain. I haven't noticed any side effects using Ultracet. If anyone knows how long you can stay on Ultracet without any harm, please post your knowledge or experience. Should I also have my blood monitored periodically?

I'm only 21 years old, Female from NY. I was born with scoliosis and i've been in two major car accidents. I take about 2-4 Vicodin's a day, and decided to try Ultracet in order to decrease the amount of acetomenaphen to my liver daily. I find that I need to take TWICE as many Ultracet in order to feel comfortable daily, well about 4-6 pills daily.

I remember having side effects years ago, I think i'm totally immune now when it comes to Vicodin and Ultracet.

Am I the only one who's taking more than 3 a day?
I now notice that I am probably better off just sticking with the Vicodin, as I have chronic back pain and nerve damage in my spinal cord. As for the addiction part... I cannot go more than a day without my meds, so I am addicted. My advice to those who have to take these medications daily to keep a quality of life? Do as I do, DONT EVER RUN OUT!

Good luck all.