Serotonin and dopamine are horribly confusing when it comes to symptoms and hypo/hyper activity.
Wikipedia says (although with citation needed, lol) "Serotonin inhibits the fleeing reaction in subordinates, but enhances it in socially dominant or
isolated individuals." and (with citation) "The effect of 5-HT1 receptors predominates in subordinate animals, while 5-HT2 receptors predominates in dominants [and presumably in isolated individuals as well]". So, increased serotonin activity is not nessesscarily anxiliotic. It largely depends on the environment and other factors (which I would imagine is more complex in humans than simple dominance/isolation).
I would say that your reactions to the supplements you listed are fairly normal.
Higher serotonin has been known for making people feel number, and Rhodiola isn't all that great in my opinion (when it works for me, it also increases anxiety, and I react really well to other stims).
I think you should try supplementing with choline and see how that goes. If the choline bitartrate does nothing, don't give up on choline. Bitartrate is the least bioavailable form of choline, so you may want to try something like CDP choline or Alpha-GPC. Choline's effects seem to be kinda opposing to dopamine from what I understand. Anti-cholinergics used to be used to help parkinsons patients, so it would logically follow that increasing choline may help with high dopamine, right?
Another thing, if you have access to a doctor, may be
Mirtazapine. It is interesting and tolerated very well. In the binding profile list one the wiki, lower Ki values correspond to higher binding on those receptors, by the way (so an antagonist with a Ki of 1nM will be more potent than one with a Ki of 20nM). It seems like it may be helpful for you. It only increases serotonergic activity on specific receptors and it looks like it decreases dopamine activity on D4 primarily, the one that is the primary subtype [or at least one of the primary ones] indicated in ADHD (hypo in ADHD, so it may help with your overfocus. (however, remember that hyperfocus is also present in ADHD to a degree))
As cATsE said, adrenals are a big thing you should check too. You can go to a doctor and have blood tests for it. However, it may be difficult, depending on your doctor. Mine was really reluctant to test anything, really. She said that my insurance wouldn't cover it considering my age and lack of health complaints prior and that if I had complained about it in the past it would be easier to get coverage. So, really, it may be best to go ahead to the doctor and start complaining so that the problem is documented and thus will be justified to the insurance company. I would get blood tests on thyroid, adrenals, and sex hormones, any of the three that you can get covered. Thyroid is part of the basic tests, and while that doesnt seem to be the problem, it is still best to get it checked out.
In the US, you can still get ephedrine OTC in the form of Primatene tablets (for asthma if they ask). Try ephedrine and see how your react. If you don't want to do the kinda shady situation required to acquire it, try pseudoephedrine, about 120mg(instant release) for a good dose, but test it first at a lower dose to make sure you don't have bad cardio effects from it. They pretty much boost the adrenergic stuff(epinephrine and norepinephrine) so they may be helpful and it would be interesting to see how you react. Pseudoephedrine isn't going to be nearly as good as ephedrine for this purpose, but it will be a very very mild indicator, a better indicator if taken alongside piracetam.
Good luck. Don't know if I have been helpful, but I kinda forgot what my main point was, lol [time for bed].
Try tianeptine. 
I'm not a doctor though but if I was in the US and had to actually pay to merely see a doctor I would just order tianeptine hehe.
Tianeptine is an incredibly interesting drug, one that I would really like to try to see how I react to.
However, I don't know if it would be especially useful in his situation if he is correct that excess dopamine is the problem considering that it seems like it increases dopamine activity. Still, whats the harm in trying it since it has such a good safety profile and seems to be available on the internet? Just watch out of the suicide thing.
