I'm a Zombie on Elavil. And you?

Has anyone else experienced a perpetual zombie-like stupor while taking Elavil (amitriptyline) or similar drugs like nortriptyline (Pamelor in the US)? How about un-steadiness? Feeling un-balanced?

I've been taking 50mg Elavil per night, religiously, for about 6-8 weeks now, having incrementally increased my dosage from 10mg over the past 4 months until my headaches came under some sort of *control* (I use that term loosely). For the past few weeks, I've actually had some headache-free days, or headache-free segments each day. This, I hope, is due to the elavil plus more sleep.

However, I've noticed I feel drugged-out and unbalanced much of the time. I'm experiencing the following:
1. Waking the Dead: it's impossible to wake up in the morning, even after taking my drugs at 7-8pm the night before. My alarm rings for a full-hour some mornings. It's like waking the dead.
2. Walking the Dead: once vertical, I still feel like my body is asleep - physically sluggish and lethargic, and mentally un-alert. This lasts for hours, this S L O W motion ride, sometimes until noon.
3. Sleepy: I feel very sleepy A L L the time. I yawn a lot. I could curl up under my desk and fall asleep at any time.
4. The Big One: I feel unbalanced, unsteady, and uncoordinated (especially in the morning). This isn't dizziness (no visual changes), but just notice that my body, my movements are unsteady. I have to be careful I don't fall in the shower, and find myself bumping into walls, my vanity, etc. I have to be very careful getting ready for work, continually conscious of steadying myself.
5. Sometimes the un-balanced, un-steady feeling lasts all day. I'm consciously aware of steadying myself and moving carefully, with intention, being careful not to stumble on the train platform, that kind of thing.
6. I've had these feelings both with and without headache being present.
7. This has been going on for 2 weeks.

Basically, this drug makes me catatonic. That, or the unsteadiness is (i) a vestibular effect of migraine (which is new) or (ii) I'm developing MS or Parkinson's or some other bloody neurological disease.

Any way you slice it, it isn't pretty. It's also distressing.

So here are my questions for you:

1. Have you experienced un-steadiness and feeling un-balanced while taking Elavil?
2. Have you experienced un-steadiness or feeling un-balanced with or without the presence of headache?
3. What's the highest dosage of Elavil you've taken for an extended period? Did it help control your headaches?

Thanks!