First off, you don't need to say that it's your friend who's having these bad trips. No one will know who you are from your username or whatever, and you couldn't get in trouble for just talking about drugs on the internet anyway.
Anyway, you aren't screwed up or anything, the problems you've been having are very typical, and most inexperienced trippers get them.
Your first bad trip was a result of being disoriented an uncomfortable. It's generally not a good idea to trip in an unfamiliar environment, especially at night, unless you are a very experienced psychonaut. Most people will get confused and scared, thus causing a bad trip.
The second experience happened because you were left alone. When you are by yourself, your thoughts tend to bottle up and spiral out of control because you have no one to talk to. You can lose connection with reality, and have a bad trip.
The third trip happened because you felt overwhelmed and panicked. If you feel like your mind is getting away from you, do not freak out. Try to remember that you are simply experiencing what shrooms do, and you aren't getting screwed up or going crazy.
I would suggest staying away from acid for a while, for two reasons. It is unlikely, but possible, that you would get too strong of acid, and become overwhelmed. Also, acid lasts much longer than shrooms. If you're having a bad trip, it will last much longer than a bad trip on shrooms.