How long have you been having these symptoms? What other symptoms are you noticing?
Usually, sciatica resolves on it's own in a few days to a few weeks. Ice is good, it helps reduce the inflammation and pain, it be careful to use it 15-20 minutes on, then off for an hour.
OTC anti inflammatory meds helped me quite a bit when my sciatica would flare as well.
If the pain worsens or your symptoms increase, or if it continues past 3-4 weeks, you should see your primary for further suggestions .