I have been having pretty bad sciatic nerve pain for the last 3 weeks. do i need to seek medical help or can i do something on my own to help it?

See your doctor: 3 weeks of sciatic pain (pain running from your back down your leg) deserves an evaluation. An MRI is likely in order.

See a doctor : Although usually sciatica is a self-limited problem, it may take 3-5 weeks see your family doctor to get some analgesics and evaluation of potential serious issues.

Core strengthening: Exercises that strengthen the core can be helpful in maintaining integrity and reduce stress on the spine. Typically disc herniations will resolve on their own as soon as 3-6 weeks or as late as 6-9 months. Just depends on how you take care of yourself, exercise, anti-inflammatories, tylenol (acetaminophen) and if you need to lose weight that will help immensely. You may still need an epidural steroid injection