I think you weight is ideal for the height you have mentioned then why do you want to take weight gainers....
You have not mentioned the grade of fatty
liver back in 2013...
You need to stop weight gainers and get an ultrasound done of abdomen for assessing the current grading of fatty liver...
Your bilirubin is raised but no mention of liver enzymes status....
Also you have recently started exercises so it's quite possible that the pain might be due to the stress of exercise on you core body muscles also
Next Steps
stop weight gainers
get ultrasound scan done
Health Tips
avoid fatty and oily food.... continue with light exercises