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Dr Dinesh has given you an excellent answer. Following an MRI scan, your treatment will depend on the degree of your nerve compression seen on your MRI scan (not visible on X-rays).
If mild compression, your sciatica leg pain is from a nerve irritation or inflammation and will slowly but gradually improve naturally after 1-2 months of back rest/care, pain medications and physical therapy. Radiofrequency/injection is optional as the effect, although immediate, is only short term temporarily and is reserved for severe pain despite the above treatment. Surgery, although helpful, may not only be unnecessary at this stage, it may cause you more harm if you have an unfortunate surgical or anaesthetic complication.
However, if your sciatica leg pain is caused by severe compression on your MRI, none of the above treatment will help in long term and surgery will now be needed to directly and permanently relieve the compressed nerve before you end up with permanent irreversible nerve damage when its too late to do anything helpful anymore at this later stage.