the body's response to continued pain and stress is to mitigate these symptoms with a huge increase in energy ( adreneline) and to produce a chemical mediator chemically identical to opiates, known as endorphins. Thus a runner, reaching a good workout often involves a chemcal boost that creates large amounts of energy in the short term In the case of pain, this can increase anxiety and jitteryness. It can also create a sense of calm.Like all such quick energy boosts, your body will consume and anabolize sugars very quickly to fuel this energy, but this comes at a cost. What comes up...must come down. So the leftover state leaves one drowsy afterward and with less blood sugar, leaving one feeling tired and dopey. I would hazard a guess, that you probably get quite jumpy towards the end of an electrolysis session?
I've heard a lot of descriptors for this phenomina over the years , " runners high" being one of them.The key to helping would likely to be finding ways to deal with the anxiety and stress before a session. All the usual discomfort control advice fits here, get a good nights sleep before, dont add stress to your body, avoid caffeine, drink enough water .