I have gone through your query and understood your concerns. As you have history of basilar migraine
with aura you must be very careful and please avoid the factors aggravating you. I suggest you to have tube ligation as you have enough children now. As pregnancy
itself is a stress
and stress is most important aggravating factor. I suggest you to consult a neurologist
for prophylactic treatment for migraine which will help you to get some free intervals. For edema of your legs you have mentioned it is normal after delivery but still I suggest you to have blood urea and serum creatinine
levels get checke by your doctor. Thank you.