Hi, I was taking three tablets a day of zapiz 0.25 among other drugs as per doctors advice as a part of my post herpatic pain management. Then as per second opinion I learnt that this dose was not needed. So I stopped it along with the other drugs prescribed, and hopped on to the new regime of taking a Maxgalin 150 ER every night to manage the pain. Now my problem is, since a week I am not getting a wink of sleep over night. I am not even feeling sleep during day time. Is it a withdrawal syndrome of zapiz or the side effect of Maxgalin?