http://thespiritscience.net/2014/12/04/kundalini-activation-or-what-is-happening-to-my-body/
We see this fairly often, a person goes through an intense spiritual or transcendent experience, and afterwards they begin having some very strange things happen to them. They may start having sensations of intense heat or energy flowing through their body. They may start hearing tones, often very high-pitched. Their body may begin to feel like it’s vibrating, or they may feel pressure in their forehead. It’s common for people to believe they’re going insane or even dying when this stuff starts to happen, but don’t worry, all this is actually quite normal for a being who has chosen to raise their Consciousness, and it’s called Kundalini activation................more at the above link.
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This is something people need to be aware of. It certainly is a part of ascension.