It started - for many people at least - before Fukushima. Here's what I posted on another thread:

Ear-ringing is a symptom of radiation treatment, or exposure. There are other symptoms: pressure headaches, 'night sweats', damage to immune system, abdominal discomfort, swollen thyroid, skin rash, occasional dizziness, shortness of breath, nausea, lethargy, sleeplessness at night, and eventually brain damage, as well as strokes and heart attacks.

The radiation is leaking down through our weakened atmospheric protection and hole-ridden magnetic field. I had the ear-ringing, pressure headaches and night sweats, starting when the animals started falling down dead en masse in January. As a test, I put up some shielding between me and the sky and poof, the symptoms disappeared and haven't returned.

I think it's mainly microwaves and x-rays doing the damage. It's killing off the animals. It's sickening us humans and undoubtedly slowly killing us too, as well as driving some crazy with the brain damage. It sickened those eight people at the beach in Chicago over Memorial Day weekend. It's killing children off now in India (children are the most vulnerable to it).

I think the spread of the brain damage in the human population is why the CDC issued that 'zombie alert'. The brain damage can manifest lots of ways: depression, aggression, personality changes, involuntarily speaking in gibberish like those reporters, memory loss, inability to focus, dementia, schizophrenia and psychosis. Psychotic people would be like the fast zombies, but you wouldn't need to shoot them in the head to kill them, and they wouldn't inflict their brain damage on you with a bite. But they'd be worse in other ways: able to plan and use weapons.

Me, now that my symptoms are gone, I'm gonna be staying as shielded as I can for as much of the next few years as possible. You'll have to make your own decisions regarding what you do or don't do, and what consequences you are willing to accept in terms of damage to your body, your internal organs, your neurology.