Thank you for your query.
I think you need an evaluation by a Neurologist
are not normal.
You might be having migraine headaches as a quiet cool dark room seems to soothe you.
They could be tension headaches, cluster headaches, positional headaches.
Also, they seem to be related to posture, so it could be due to hypertension
However in pregnancy
, it does not make sense to take just about any medication by yourself.
COnsult a proper specialist, have a thorough evaluation and then take appropriate medication