Neurontin and od

I am on my 10th day on Neurontin at 300mg OD for a severe cervical muscle pain, the pain did go away but... at first the only noticeable side effects were drowsiness especially in the AM, loss of coordination. But a few days later, the numbness on my lower extremities was noticed as well as moderate to severe headache more on the frontal area and arthralgia (joint pains). I also had episodes of irregular heart beats so I had to be put on Betablocker. The dosage was not that big, but anyway, patient's response varies individually. This will be my last day of Neurontin. I hope my body will eliminate all the traces of this drug.