I'm looking for some information in the effects of methane gas on health. We have been told by the council that we have a build up of it under our garden, but not to tell anyone whilst they take samples to fine out what the levels are. If they are high they will then start to take samples from inside the house. My daughter is always sick. Wakes during the night vomiting. Ihad her at the doctors today after another episode last night. Doctor has referred her to the hospital as she is on general good health.