It looks like you need to normalize your digestion.
uddyiana bandha is very good for that. It gives a boost to all internal organs due to intensive movements; you can find it there: http://www.holistic-online.com/Yoga/hol_yoga_pos_home.htm
Also very simple change to the eating habits:
do not eat after 5pm
make last meal only fruit of veges, e.g. 3-5 apples
fast one day a week (24 h)
most likely you will start to loose weight without any other drastic measures - consider it a bonus