Sideeffects of Allegra

I started taking allegra for 2 month and around 10 days ago I started experiencing several side effects. It stated with pain in both legs. I stopped it right away. But during last 10 day other side effects were added to my problems such as sweating at night, insomnia, tingling in hand and legs and restless leg syndrome symptoms. How long these side effects will be with me? Should I visit a doctor for these problems? Thank you so much.