ADVISE! Kidney infection and in pain!

I went to the ER Wednesday with lower left side back pain , we'll the doctor said I have a kidney infection and sends me home with antibiotics and ibuprofen 600 mg , we'll it's Friday now and I woke up in a great deal of pain and don't know what to do the doctor I seen already treated me like an idiot for coming to the ER and my husband wants me to wait it out to see what happens. I am just over whelmed about this and need some opinions on what to do please! Do I go back to the hospital ? Wait it out ? Or just push through and hope it stops ? What would you do?