A tincture or tea of catnip and fennel will help relieve the gas and bloating - be very careful of doing enemas while you are pregnant as this could bring on labor. When you cause the intestines to contract, they can irritate the uterus into contracting.
Eat lots of fresh fruit and fresh juices - this will help your bowels to move. It sounds like you might need to increase the LBB. The reason you are so hungry is because your body is not getting the nutrition it needs, so you keep eating trying to find it. Make sure you are taking the right supplements so your body will get what it needs, then make sure at least half of your diet is live. This will help give you the enzymes you need to break down your food so there is not so much bloating.