When we arrived at motel was welcomed. Room was rustic and bed was comfortable. Shower great water pressure. At 12:40 AM, I was awoken by a gaseous odor in which caused my heart beat to become fast and irregular along with shortness of breath. I got up and woke up my other half. We went outside and got into our car, where we could escape this gaseous odor. Within 5-10 mins., my heart rate started returning to normal, although still short of breath with difficulty breathing. My stomach was upset from this exposure to the point of dry heaving. My other half had a headache and sore throat and was nauseous. At 1:45 AM, I opened the car door in order to find out if the odor was gone. It was gone. We went back into the room and the odor was no longer detected. We went back to bed and within 60 mins., this same gaseous odor had started to resurface in the room. I started to have heart problems as before with the other symptoms as previously stated. I got up from bed and woke my other half. Went outside and started to dry heave. Got into car. Other half came out to car as well. Called 911 and by the time they arrived on scene, the odor had magically disappeared. The emergency personnel stated it was probably the marsh. We stated that marsh odor would not have caused the heart, pulmonary and neurological issues. We have been around other area marshes that have odors and did not get sick. Questionable what happened here. Hotels.com called owners, owners denied a refund. Stay away!!