Can testosterone therapy help with erectile dysfunction?

Hello doctor,

My wife is not satisfied with our sex life. I have two kids. Unless I stimulate myself with porn or masturbating action or licking my nipples, I do not get an erection. I have weak libido, and I am unable to sustain an erection for a long time or continuously and also ejaculate prematurely in around 2 minutes. My testosterone count is 248.7 ng/dl. My height is 5'8" feet, and I weigh 227 pounds. I am trying to get fit, but I am very stressed. I visited a sexologist, and he examined my genitals and said it was normal. It is 3 inches on average and 5 inches while erect.

My questions are:

1. Should I go for testosterone replacement therapy, or will something else help?
2. Can you let me know where I can avail of such treatment? Do you have any recommendations?
3. What is the expense, and how many days it takes?
4. I read online that there are many suggested therapies and side effects. Which one do you recommend?

Thank you.