Here is simple tea for impotence which be triggered by irritability.
Rose 10g and Albizia 10g which mixed by hot water 500-800 ml in a tea bottle ,and close top waiting for 10min . each 1/2days .
In Chinese medicine theory Rose can relieve Qi stasis of liver and blood stagnation , liver dominate sinew of body and penis is a part of sinew , therefore it's good for impotence cause pressure .