If the tremors in the head are triggered by scares, nervousness, anxiety or stress, they are likely to have an origin psychological.
Muscle cramps and spasms can have many causes. The origin may be in the nerve, in the muscle or even have emotional background, as stress, anxiety, nervousness.
There are still neurological diseases which cause tremors, which can worsen in times of increased stress.
In your specific case, it is best to look for a psychiatric doctor, since the problem seems to be related to psychological and emotional factors.
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