Thanks for your question.
What you have experienced is similar to most of the patients with this condition where they will stop responding to a medication. In such a case increasing the dosage is recommended. However if increasing the dosage leads to increased side effects then switching to another medication is recommended. So yes you may go back to Gabapentin in consultation with your doctor and see whether now it is beneficial for you. If not there are other medication which may be prescribed by your doctor.
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