I took this medicine for approx.3 weeks after back surgery.I am diabetic and had stopped taking it for last 2 weks.I am type 2 diabetes and taking glipizide er 5mg.once a day regularly.My blood suger level has been high eversince.Fasting suger runs approx.250 and after meal over 350.My suger was in control before.how long does the effect lasts after stopping .