Possible to have csf leak 3wks post esi. l4-l5. bad headache/foggy/no fever/ nauseated/no vomiting.how long does the headache last?4-5 days already.

Yes possible: Headache (HA) after epidural steroid injection (ESI) rarely occur this late but are possible. Is HA worse when standing/sitting up & less/gone if lying down? Can be associated with nausea, vomiting, dizziness, or visual disturbances. Treatment includes being flat in bed for least 24 hrs, hydration, & analgesics. Since already 4-5 days, I would call physician who did ESI right away. Drink!!