Why Am I Having Warm Sensation On The Left Side With Lightheadedness, Dizziness And Mental Confusion While Walking And Sitting?

Having warm sensation on Left side with light headedness, dizziness, and mental confusion when walking and sitting. Lasting greater than 15mins at times and more than one time a day for last couple days. What should I do? Could this be due to increase of Prazosin HCL? I went from 2mg at night to 6mg at bedtime.