In a woman presenting with amenorrhea headache, blurred vision and galactorrhea appropriate investigation:
A women presenting with headache, blurred vision and galactorrhea raises of a pituitary prolactinoma and so appropriate investigation would be:

S prolactin (most important)
TSH (as patients with hypothyroidism have elevated TRH which acts to stimulate the release of prolactin)
X ray skull (shows space occupying lesion)
MRI
Contrast enhanced CT
Prolactin levels
LH
FSH
HCG