What Causes Sharp Pain In The Scalp?
Occipital neuralgia may be considered.
Detailed Answer:
I read your question carefully and I understand your concern.
The location and the characteristics of the pain you describe do not suggest any serious issue, certainly not the case of a brain lesion. One possibility to explain it would be occipital neuralgia, irritation of the occipital nerve which supplies sensation for that area, which may produce such short lasting pains as you describe.
However, that is more common in older individuals who have chronic changes of the spine which lead to irritation of the nerve, less likely in a 19-year-old individual. So perhaps a psychological component should be considered as well, which may cause muscle tension and spasms and produce such pain as is described.
For the moment I wouldn’t add any medication apart from the occasional over the counter pain killer such as Ibuprofen if really bothering. If persisting in time (it is unclear how long this has been going on for) then imaging of the head and neck and medication with neuropathic pain medication such as Gabapentin might be considered.
I remain at your disposal for other questions