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The headache may be related to migraine
which inturn has been triggered due to stress
and the hormonal
imbalance by the abortifacient drugs.
i tell patient time and again that these drugs should be taken after safety screening by a doctor but few people comply.
Now because you have already taken the tablets and now land up in trouble do not think it is pointless to to to ER.
You should go as soon as possible to ER, tell the problems and also tell that you have used these drugs.
There are good drugs and therapies to manage these complications but it needs treatment under clinical supervision.
I hope the advise would be informative and useful for you.