Yes you are this amazing amazon woman but right at this time you are feeling vulnerable and out of control of the situation and you want/need someone there who will watch out for your best interests. That is a perfectly natural thing to want. Maybe your brother has become used to you having tests and doesn't appreciate why you are so fearful this time around.
Get that amazonian spirit together and spell it out for him-I am sure that once he(and she) realises they will change their tune,
Hope it all goes well, (((hugs)))