Phenetramine is a drug used to treat obesity. Phenetramine causes withdrawal reactions and it is known to cause addiction on long term usage. Hence it has to be used for short periods
under supervision of doctor.
It is not known to cause the symtpoms like constant headache
and other symptoms which you have quoted. Even the birth control pills is not known to cause the symptoms which you have mentioned.
Hence I advice you to consult your physician for evaluation and treatment of headache.