You have a right to be scared! I'm glad you went to the doctor and that everything looked OK. 5w5d is JUST on the border of being able to hear a heartbeat so I would try not to worry about that.
Are you following up with your own Dr at all? I would try to get in for a follow-up sometime this week. Not for any reason other than I like all the reassurance I can get and I'm not afraid to call my doctor's and ask.
Re: Spotting during first trimester