Evidence has started to mount regarding a new category of environmental risk from the Gulf oil spill. Physically-fit and healthy Americans exposed to dispersant chemicals quickly have become ill or died.

Paul Doom, 22, from Navarre, Florida, was training in preparation to join the US Marines, until he became extremely ill from swimming in the Gulf of Mexico.

“I stopped swimming in July because I started having severe headaches that wouldn’t go away,” Doom told Al Jazeera. “But each time I went to the doctor they dismissed it.”

In October, Doom began to have internal bleeding, but this too was dismissed by doctors. In November, when it worsened, he was given pain medications in the Emergency Room and was told it would pass. Less then three weeks after that, Doom collapsed with a seizure.

“Since then, I’ve had two blood tests for Volatile Organic Compounds [VOC’s] which are in BP’s oil and dispersants, and they both came back with alarmingly high levels,” he said.

Since the onset of his symptoms, Doom has been dealing with ongoing internal bleeding, nose bleeds, bleeding from his ears, blood in his stool, headaches, severe diarrhea, two to five seizures per day, paralysis in his left leg and arm, and failing vision.

“A toxicologist that interpreted my blood VOC results told me they didn’t know how I was alive,” Doom explained. “My Hexane was off the charts, and I have 2 and 3 Methylpentane, Iso-octane, Ethylbenze, and mp-Xylene.”