I'm hoping it is merely that an otolith has come loose from its gravity sensor and is tumbling around in the semicircular canal triggering unexpected signals from my motion sensing hairs. If that's the case there are some simple exercises I can do that cause the otolith to become wedged where it can't cause any more harm. So far these exercises haven't helped.
An alternative explanation that I'm less keen on is that I've somehow poisoned myself. Last night was my once-a-week protein night. As usual I had a can of sardines for the protein.
Having come from a long line of vegetarian apes, we humans are not terribly well adapted to eating meat. Unlike many genuine carnivores, we don't have a liver capable of rendering safe many of the dangerous poisons in unfresh meat. A dog could eat with relish a piece of meat that would quickly kill a human. I'm still alive, so I don't think the sardines were unfresh.
Freshness isn't the only concern. With humanity using the oceans as major dumping places for all kinds of toxins I have to wonder what we take in through fish.
In many parts of the world heavy metal contamination of fish is a major problem. Of the heavy metals, arsenic is the only one that I know of that is associated with vertigo. Unfortunately it often turns up in sardines. A pity, because sardines are exceptionally nourishing for hermits like me.
I also drink well water. The government no longer offers free water testing, which strikes me as very short-sighted. I have no idea whether my water is contaminated with arsenic. It is a very common problem in many parts of the world. We have filters that take out all microbes in the water, along with many of the chemical contaminants. The filters are overdue for changing, so I'll do that tomorrow.
There is another interesting, but disturbing possibility. Over the past week, or maybe a bit longer, I've been feeling an odd kind of vertigo whenever I angled my head to look inside a computer that I was rebuilding for a friend. I thought little of it at the time, but later as it kept recurring when I would put my head at an unusual angle, I began to wonder more about it. I tried closing my eyes and moving my head to induce the feeling, and I didn't fall over, so I figured this wasn't normal vertigo. It wasn't sickening; it just felt weird. I resolved to simply keep an eye on it and see what happens. I really didn't expect this sudden, full-on, stomach-wrenching affliction that hit me today after my nap.
An odd thing about the nap, too. Normally my midday nap lasts only about 20 minutes and I wake refreshed and ready to attack whatever problems I'm working on with a reinvigorated, alert mind. Today my nap was, I think, about 2 hours. That only really happens if I've been neglecting my night-time sleep. But I'm pretty sure last night I got almost a full night's sleep. (I have, however, a terrible sense of time, so I can't be certain.)
If this problem hasn't eased by Wednesday I'll make an appointment with the doctor and take it from there.
Now I'll have my dinner (a lovely bowl of veggies) and hope I can keep it down.
Additional: The veggies were delicious, and I'm feeling much more settled. I still have the vertigo, but it isn't making me feel quite so ill anymore... perhaps because I've been keeping relatively still. I'll be interested to see how I feel in the morning. Early to bed tonight, I think.
Further: I went to bed early, however I only slept about 4 hours before waking again. I was surprised and happy to find I no longer had vertigo. After taking little Nata the dog out for a walk and wee I came back in and succumbed to the lure of the computer. About 3 hours later I noticed the beginnings of vertigo again, so I went back to bed to sleep about another 3 hours. This time when I awoke it was with noticeable vertigo once more. I managed pretty fine in spite of it, then had another nap about midday. I deliberately slept on the side I'd woken on a little after midnight when I'd been free of vertigo. And when I woke from my midday nap I had only very slight vertigo. Excellent.
I rang Mum to tell her about it and she wasn't there, but Dad was so I explained it to him. He surprised me by telling me he'd had short episodes of vertigo for many years, about once a year or so. Oh dear. That may mean I have these "delightful" experiences to look forward to every now and then for the rest of my life. Well, people have worse afflictions. I'm sure I'll manage fine.
(Crossposted from http://miriam-e.dreamwidth.org/329007.html at my Dreamwidth account. Number of comments there so far: )