Hi, Welcome to Health care magic forum.
In 9th month post partum, you had
swollen lymph nodes in the neck. Previously you had them but cured with medicines, this time they didn't go away.
It might be due to the infection some where near by, or due to the
head lice. Unless the source infection is cured they wont go away.
As well you have
fatigue, bleeding after sex once, pains, moody,
palpitation, stomach problems.
All these symptoms could be due to the gastric hyper acidity due to the antibiotics.
The other causes may be
hypertension usually occur during perpurium, called post partum eclampsia. Ofcourse it may not be there but ut should be excluded.
So i advise you to consult a physician for diagnosis and treatment.
Wishing for a quick and complete recovery. Thank you.