brain injuries

I suffered a brain injury five years ago. Three years post-injury I started working with an overseas homeopath who prescribed Arnica Montana 1M almost in the exact same manner that Mr. Joe De Livera did in one of his posts. The one difference that my homeopath prescribed was to take one teaspoon of the succussed solution and dilute that futher into one 8 oz. glass of water -- and then take one teaspoon of that solution, once per day until a negative result occurred. I took that remedy for about 10 days, until I had a tremendous blow-up spasm in my left shoulder, which took a couple of months to subside. On the bright side, I noticed some small yet significant improvements with the severe fatigue I experience and dealing with ambient environmental stimulation. I only took the Arnica remedy once -- in Nov/Dec 2003.

The following June, the same homoepath prescribed Lachesis 200c -- which took me to an entirely different level regarding my ability to drive. While I could always drive, after 30 minutes, I needed a nap. Now I can drive for 2-3 -- but not every day -- without needing to rest. Thank you Lachesis 200c. I took that dosage twice within a couple of days and never again.

The homeopath thereafter prescribed Lachesis 1M in November of 2004. While I felt a similar buzzing and sensation from the remedy, I did not notice any corresponding benefits from it. The homeopath just recently prescribed Belladonna 200c, and I've felt nothing.

I still have enormous deficits in terms of fatigue and cognition, though I am doing better than I was. I have a few questions:

(1) Would it ever be indicated to take a remedy that worked before again? Would I benefit from another dose of Arnica 1M or Lachesis 200c?

(2) Alternatively, would a higher potency of Arnica -- such as 10M -- help with a brain injury?

(3) Given that my condition is considered chronic (and conventional doctors label it as "permanent" and "incurable"), would I be better served by using a lower dose more frequently?

(4) What would happen if I took a high potency remedy several times? I stopped using the Arnica 1M when my shoulder went into spasm. What if the shoulder never would have spasmed? When would I have stopped? What about the Lachesis 200c -- it helped after taking it twice. Would it hurt if I would have continued to take it?

(5) When a constitutional remedy is prescribed and taken -- and results are observed -- does that mean that that particular constitutional remedy is no longer indicated for the problem at hand??? Are Arnica 1M and Lachesis 200c forever unhelpful for me in pursuit of wellness with respect to this terrible injury?

(6) I've just recently taken Belladonna 200c twice -- in the evening and the following morning, as prescribed by my homeopath. As I mention above, I didn't feel anything. I have been remembering my dreams more vividly, however. Other than that, I've had no healing crisis. I've had no aggravation of symptoms. I've had no indication of benefit. It is possible that I would have fared better under a lower potency -- say, 30c, once or twice per day for one week? Or, is it possible or likely that I may experience benefits from the remedy notwithstanding no noticable reaction to the chosen remedy?

(7) What would happen were I to take the 200c Belladonna everyday for the next week? Is it possible to negate the positive effects of a remedy through over-dosing?

I appreciate any insight that anyone can shed.