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Here is a very interesting study that links low blood sugar and bad mood.  Remember that testosterone replacement can improve insulin action and possibly decrease blood sugar and insulin blood levels. This effect may be higher at peak blood levels of testosterone after injections.  It is just a hypothesis worth exploring.

"According to new research published in the journal Proceedings of the National Academy of Sciences, spouses display more aggression toward each other when they have low blood sugar levels. As those who find themselves getting cranky with a loved one when their stomach is growling know, being “hangry” (that's hungry + angry) is a real thing—and now there's science to suggest why.The researchers measured people's aggression toward their partners in two ways: by having them choose how many pins—from 0 to 51—they wanted to stick into a voodoo doll representing their spouse, and by telling them they could play loud, annoying noise into their partner's headphones after competing against them.

“As expected, the lower the level of glucose in the blood, the greater number of pins participants stuck into the voodoo doll, and the higher intensity and longer duration of noise participants set for their spouse,” the researchers wrote in the study's abstract."