I have fatty liver. Could it leads to Hep B or C?

Dear Doctor,
I really need your help since I have been with more than 2 doctors but they CANNOT find the main cause which cause me fatigue and joint pain. Here is my symptoms scenario:
- I am 49 year old and work as an engineer with start up company in bay area for more than 15 years. It is sometimes very stressfull, the company provide us with free breakfast (muffins, croissant, bagels...), lunch and dinner (mostly fast food: burgers, hotdogs, chinese food, pizza), free drink: coffee, soft drinks (you name it). So more than 15 years, I end up with Gallstones and had Gallbladder removed in 2004. My triglycerides at highest point is 700 at year 2002, now it around 320. I am taking Lopid to lower my Triglyceride. The doctor said I also have fatty liver. I had tested for Hep B and Hep C but all come back NEGATIVE. My ALT fluctuates sometimes within range and last time creep ups a little bit at 48.
My latest MD had me have a CT SCAN but could not find anything other than fatty liver.
I am puzzle because I now start to have joint pain, my ALT creeps up (at 48), my body is aching, sometimes light headache and light chill. I did go excersice at the gym but the next day my joint pain again. I feel terrible because the doctor doesn't know what happen.
Could I have Hep B or Hep C even my test two years ago come back NEGATIVE. I am a married man, have one 5 year old son and did not fool around.
Could you let me know what can I do to get back a normal life. What other test should I need?
Please help. I desperate need your help.
Thank you very much.
--John

[Douglas Dieterich, MD]

Fatty liver can certainly cause fatigue, so you should exercise and lose weight for sure. However if your joints ache then you need to see a rheumatologist to diagnosis and treat the causes of joint pains and arthritis. Good Luck! DTD