Is it normal to have back pain at the injection site of my epidural 2 months later?

No: Rarely. There is a distinction between continuous pain 2 months after an injection and the fairly sudden onset of pain after 2 months. In either case, it is best to follow up with the original person or team that assisted in your care.

Most people : Do not have long term pain at he epidural injection site. However, some do and it can take some time to heal. Try warm compresses and anti-inflammatories. If you can't, or it isn't getting better, consult with your doctor.