Dysfunctional on eroticism. Only.

Sir, i have taken viagra 50 for 1st time before 3 months and it remain my penis erotic for 7 days constantly and after 7 days again i used for second time and in 1 month again i took for two times and it worked although i didn't have any problems.but before 1 month again i took for a single time and just day before i took 25 mg vigara and after 25 minutes i took another i and i had sex for two times and i reached to orgasm.but after them till now i have my feedings loss of sensation and its not erotic to my penis for a single time.sir and one mote thing i did stooped passing out my sperm before i reached to orgasm for 2/3 times.am i suffering any problem or it just my feelings only.please do best suggest me what should i do