Frequent urination. Taking other drugs.

For the past two day, I have been experiencing frequent and uncontrollable urination. I have needed to urinate 4–5 times within a interval of just 2–3 hours during the working day, and I find myself unable to control the pressure of it. Each time I urinate, I feel some burning sensation.  After taking lot of water the first urine of the moring is yellow and still painful to painful and burning. Also I have been feeling dehydrated, yawning excessively, and experiencing frequent hiccups and burping despite drinking a large amount of water. I also feel nauseous. Only the new things is that I started taking two psychiatric medications prescribed by my neuropsychiatrist: Samzep 0.5 and Fluoxetine. I also had excessive acidity and a sensation of internal heat, when all this freq urination start. My kidney functions well since in a year i took twice usg, kft test. Apart from the recently started psychiatric medications, I have no prior history of taking other drugs.