How To Treat Premature Ejaculation And Erectile Dysfunction?

hi i am male here from delhi, i have some thyroide problem from last 5 years. actually problem is this that i feel a bit less erection in my penis from last few months and also during intercourse i got discharge very early. So please suggest me can i use Viagra or anything else for this. PLEASE SUGGEST SOMETHING. MY age is 35 years .