The idea seems well thought through, if rather conventional. I don't know of any similar SCPs, but I wouldn't be surprised if one existed.
If there isn't any energy emanating from this SCP, then it's quite anomalous. Presumably it has a temperature higher than absolute zero, so it should emanate heat in the form of kinetic energy and electromagnetic radiation, and if you can see it, it must be absorbing and emitting light. Also, "hz" is normally capitalised as "Hz". "Despaired" is a word, but it's a verb. "Despairing" would fit, but I'm not sure it fits with the formal tone. Maybe "distressed" or "upset"?