The first article said that "friends in Kharkov reported specific information". And you said that you are 500 km from Kiev. Are you in Kharkov?
No, I am in Russia, Orel, it's about 520 km East-North off Kiev and 380 km North off Kharkov.
That's what I'm thinking now. I've never taken any drugs so I don't know how that feels but I think I would know if I did. Also, if I felt that different then I know I would leave and I wouldn't come back till somebody identified the drug I accidentally took.
Amphetamine - Wikipedia, the free encyclopedia
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Psychological

Common psychological effects of therapeutic doses can include alertness, apprehension, concentration, decreased sense of fatigue, mood swings (elevated mood or elation and euphoria followed by mild dysphoria), increased initiative, insomnia or wakefulness, self-confidence, and sociability.[24][28] Less common or rare psychological effects that depend on the user's personality and current mental state include anxiety, change in libido, grandiosity, irritability, repetitive or obsessive behaviors, and restlessness.[ref-note 6] When heavily abused, amphetamine psychosis can occur.[13][24][25] Although very rare, this psychosis can also occur at therapeutic doses during long-term therapy as a side effect.[13][24][26] According to the USFDA, "there is no systematic evidence that stimulants cause aggressive behavior or hostility."[24]
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Dependence, addiction, and withdrawal

Addiction is a serious risk with heavy recreational amphetamine use, but is unlikely to arise from typical medical use.[13][27][28] Tolerance develops rapidly in amphetamine abuse, so periods of extended use require increasing doses of the drug in order to achieve the same effect.[62][63]

A Cochrane Collaboration review on amphetamine and methamphetamine dependence and abuse indicates that the current evidence on effective treatments is extremely limited.[64] The review indicated that fluoxetine[note 8] and imipramine[note 9] have some limited benefits in treating abuse and addiction, but concluded, "no treatment has been demonstrated to be effective for the treatment of amphetamine dependence and abuse."
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So you are sure that you, a person who has never tried any narcotic in your life, would know that your condition of "alertness, apprehension, concentration, decreased sense of fatigue, mood swings (elevated mood or elation and euphoria followed by mild dysphoria), increased initiative, insomnia or wakefulness, self-confidence, and sociability" is a consequence of a drug intoxication or it's just because of your your susceptibility to the psychological atmosphere of a great mass of people? No, you'll notice that something wrong only when narcotic withdrawal begins.

My conclusion is that the drug theory still has holes in it and I still haven't seen anything that proves there were snipers. My conclusion could change but only if I see conclusive evidence.
So you deny the very existence of the snipers! That's something new! The last known for me move of Maidan defenders was to blame Russia in the snipers' case. They said about a Russian army uniform chevron found in an alleged place of a sniper, a very shaky evidence, but I've never heard before about denying their existence completely. That's fine! Carry on!

But it's a good point that no one even got a sample.
Amphetamine is actually used in medical practice but it is heavily regulated in most countries. So what a sample do you need? A sample of a regulated but still legal medical drug which must be used only by a highly professional medical personnel in very controlled order? Suppose, you found such a drug, how can you be sure it was not misused?