Is there any kind of stress and suffering the Buddhas medicine would not help? Often my person comes accross certain "disclaimers" in regard of the use of Dhamma-Practice, the medicine of the Buddha, his therapy, saying, like just read again here in an answer:


  "The Buddha did not deal with this kind of suffering. Modern mindfulness centers have therapists who understand this kind of suffering."


So coming from such kind of predication, my person would like to ask:


What is the fundation and/or the possible reason of such a claim?
What kind of suffering it should include? and 
Where to find possible references in the teachings of the Buddha for such?
Are there any instances where either he or his disciples (with approve) encouraged to seek for diverent ways to cure certain suffering?
In the Virecana (Tikicchakka) Sutta (AN10.108):


  "Monks, doctors give a purgative for warding off diseases caused by
  bile, diseases caused by phlegm, diseases caused by the internal wind
  property. There is a purging there; I don't say that there's not, but
  it sometimes succeeds and sometimes fails. So I will teach you the
  noble purgative that always succeeds and never fails, a purgative
  whereby beings subject to birth are freed from birth; beings subject
  to aging are freed from aging; beings subject to death are freed from
  death; beings subject to sorrow, lamentation, pain, distress &amp; despair
  are freed from sorrow, lamentation, pain, distress &amp; despair. Listen &amp;
  pay close attention. I will speak."


The Buddha claimed above to be a doctor who treats the disease of suffering of samsara and all its symptoms: birth, death, aging, sorrow, lamentation, pain, distress and despair.

From Kucchivikara-vatthu of the Vinaya, the Buddha taught:


  "A nurse endowed with five qualities is fit to tend to the sick: He is
  competent at mixing medicine; he knows what is amenable or unamenable
  to the patient's cure, taking away things that are unamenable and
  bringing things that are amenable; he is motivated by thoughts of good
  will, not by material gain; he does not get disgusted at cleaning up
  excrement, urine, saliva, or vomit; and he is competent at
  instructing, urging, rousing, &amp; encouraging the sick person at the
  proper occasions with a talk on Dhamma. A nurse endowed with these
  five qualities is fit to tend to the sick."


He treats the general disease of the suffering of samsara, but not the specific diseases of the body like diabetes or malaria or even neuropsychological diseases.

So, if you need specialized treatment for a specific disease, you should see the doctor who is specialized in that area. The Vinaya quote above implies that the nurse should know how to mix medicines and be competent to treat the disease in question.

In this question, you can see that sometimes apparent psychological disorders actually originate from physical ailments. That's why medical doctors are still needed to treat them. Buddhist teachings do not treat all diseases because that is not their objective.

This answer is also relevant here. In DN16, the Buddha experienced dysentery:


  And soon after the Blessed One had eaten the meal provided by Cunda
  the metalworker, a dire sickness fell upon him, even dysentery, and he
  suffered sharp and deadly pains. But the Blessed One endured them
  mindfully, clearly comprehending and unperturbed.


So, although he had attained Nibbana, he could still experience dysentery and all its pains. However, he was unperturbed by it because suffering had indeed ended for him due to him having attained Nibbana. And after his passing away, suffering does not continue in a new life.

So what does this show? The Buddha's cure or medicine of Nibbana ends the suffering of samsara, but it does not end dysentery as a physical disease. For curing dysentery, please see a medical doctor. To cure all suffering permanently through Nibbana, please see the Buddha's teachings (which is same as seeing Dr. Buddha according to Vakkali Sutta).

The medical doctor only treats a temporary disease. If the treatment is successful, you get cured, but you could still get another disease later. But that's the point, for neuropsychological diseases and other medical diseases, you should get treated by a doctor, but to end all suffering permanently, you should seek Buddha's treatment. If you are suffering from severe pains, it's very hard to meditate isn't it? It's easier to get a doctor to treat it first, then you can meditate better.