Pain and weakness in both legs. Suggest.

Hello Doctor, Actually I'm having leg pain and weakness in both legs while sitting or sleeping position. Everything is fine in standing position. Sometimes I feel like blood flow is being block while sitting. I consulted with neurologist and he gave me medicines. In his prescription I found that one medicine is for anxiety Disorder "opiprol 50". I don't know what anxiety Disorder medicine has to do with leg pain. My query is should I stop this medicine or stop this as these medicines has too much side effect. I went for few test - PT (fine), Sugar (Fine), CBC (fine), CRP (Fine). And in prescription I'm having 1300mg dose in morning and 1300mg dose in evening is it fine because body feel like heat inside. Urine seems dark yello. Plz suggest. Thanks for your valuable suggestion.