Hi, the other day i was having sexual intercourse and i finished, but all of a sudden i couldn't have a full erection and this has been going for about a week, what should i do?

I would consider this psychological erectile dysfunction unless you injured your penis during that last intercourse, but you would have felt pain and a snap if you did. Just relax, don't obsess over this and erections should return. I trust you'll have an understanding & patient partner. Practice safe sex. You can consult a sexual health clinic or a urologist as needed.