is a GP likely to prescribe a trial of DXM though?
Just go to a pharmacy, get some Robitussin DX and try it for yourself. Watch out for the nausea though, and don't combine it with other serotonergic drugs as there is a risk of serotonin syndrome.
a DRI is on the list to discuss with the neurologist as there are many varied types and combinations and i have looked into it in the past as my brother has severe ADHD, so there could possibly be imbalances that don't quite trigger the behavioral aspects.
i do agree, but from the reading i've done after my previous treatments, finding which dopamine receptor has the issue, what the issue is and perhaps even having a combination of receptors that need opposite or varied treatment could make treatment difficult.
It could be difficult, and perhaps impossible depending on the cause of your symptoms, to narrow it all down to one or two receptors. A DRI would increase dopamine levels across the board, hit most/all of the targets and possibly improve your condition.
This makes me think of something else, a reason for why dopamine agonists might not have worked. Dopamine agonists in general aren't euphoric, however substances that release dopamine such as amphetamine, or that inhibit the re-uptake of dopamine, a la methylphenidate, are euphoric. As if only dopamine itself can provide that pleasure, and drugs that try to mimic it fall short somehow. If you can increase your levels of dopamine itself, then you may have better luck relieving symptoms.
This is all assuming that a lack of dopamine or a dysfunction of the system is to blame, rather then another disease. And long term use of a dopaminergic could worsen things, as your brain decreases dopamine output and down-regulates receptors in an attempt to normalize. Lowering your doses, or going off the stimulant, could cause a severe rebound.
Levo-dopa is another substance you could look into; a precursor to dopamine that is used in Parkinson's patients to increase dopamine levels.
im a bit unsure about exactly how much specific detail tests done by a neurologist will be able to provide, but reading through the details of Fibromyalgia again (
http://en.wikipedia.org/wiki/Fibromyalgia) i noticed a few bits and pieces i didn't think much of last time and it mentions much of what we have discussed which will be another point of discussion for the neurologist.
I have a friend who has fibromyalgia. She was on SSRIs to try and treat it, which worked for a little while but then stopped having a positive effect. The most recent news I know was that she was rx'd morphine sustained-release to relieve the pain, since she had been unable to work for a while and was on Centrelink benefits.