Vibration excites something in my body. Something drops to the floor makes sound and it feels like it excites a cloud of particles in a domino's-like fashion, its net-momentum going one-way (it branches out as wel) only once, mostly in my lower torso (Most of the time it is traveling upward). It's like a wave.
Another scenario:
Glans penis (limp state and is not sexual related) becomes sensitive while walking or riding a bike that I have to stop walking for a few mins or stop riding the bicycle (I stop because the sensitivity increases with duration of movement up to the point that it hurts). The little friction it makes with my clothing seems to get amplified after repetitive motion. It gets better once I pause. (very mild tingling involved)
Also this:
Past Events
Januari 2020
A few times tingling sensation at the glans penis and became very sensitive to any friction (not sexual related just limp penis).
Februari 2020
I ate some liver and suddenly became feverish and nauseous for less than 30 sec of duration immediately after ingestion. Perhaps 5-10 mins after there were migratory colds traveling over my body and turned into systemic cold (shivering) after the migratory cold ended.
October 2020
Washing the glans penis during shower led to activation in lower back at the spinal area (which is already sensitive), no pain, just activation of something and it isn't muscle, no feeling of contraction. Activation stops when friction stops. Applying friction again flares up activity in my lower spine again.
Prolonged low grade stress gives me a burning sensation in a layer close to the skin (some locations that can be affected: back of neck, top of both forearms, sides of upper arms, shoulders, upper back). If I have to make a guess what is going on then I think it's CRH or another neutopeptide interacting with small fiber nerve endings or the nerve endings themselves releasing neuropeptides (Or again, MCs are reactive)