I am wondering what could be the causes of my HIGH SGPT...?

I drink moderately (occassionally;I quit for a month now when the doctor told me to...),don't. smoke,i swim 1-2km 4 times a week for three months now,i work in a laboratory (in the copper mines)...

The doctor told me not drink alcohol and have "ESSENTIALE"2x a day;aside from that, there are no other restrictions...

yet..,i am a bit clueless cause my SGPT got even up from 57 to 108(as posted below),i feel 'bulgy" with my stomach after i am full when eating meals & fruits and my unusual weight gain is noticeable despite of my diet and exercise,i am having abdominal tenderness and discomfort(is it possible of malaise?)....

CHEMISTRY Conventional Units SI Units

SGPT/ALT 57.00 U/L 4 ~ 41 H 57 U/L 4 ~ 41

108 U/L 4 ~ 41 H 108.00 U/L 4 ~ 41

I am 5'7", about 175 pounds (about 20 pounds overwieght[my guess])...

is there anyone out there can help me find out some answers regarding this one...?
what are the steps for me to prevent this and keep me healthy...?