Welcome to health care magic
I can understand your situation. I appreciate your effort to seek online support.
First of all, take your child to a qualified paediatrician as its important to know the cause of fever for which he needs good clinical examination and investigations.
Don't worry and relax.
Consult a psychiatrist
for proper evaluation for post partum depression as you need timely treatment which will be beneficial for you as well as your child.
Following treatment strategies would be helpful-
1) Antidepressants like SSRIs (escitalopram, sertarline, paroxetine etc)
2) Antianxiety agents
like clonazepam, lorazepam, alprazolam etc
3) Psychotherapy/ Counselling
4) Relaxation techniques
like yoga, meditation
, deep breathing etc
In case, you are feeding your child with breast milk, use the drugs with caution and only after close work up with your doctor.
Hope it helps
Dr. Gourav Monga