Yes, I agree with PattiZ that this could have to do with anxiety. Even if you are getting straight As and going to law school, that doesn't mean that you aren't anxious. In fact, you probably have more of an anxious personality than people who coast through school/college with average grades - I speak from experience
About the previous premonitons you mentioned:
Was your cousin ill before he or she died? Could you have noticed, unconsciously that your cousin was taking a turn for the worse just he or she died, and this showed up in your dream? Or could your cousin have been behaving recklessly just before he or she died and your unconscious was pointing out that she could get herself killed? Or did your cousin just die suddenly and unexpectedly?
The DUI dream was a self-fulfilling prophecy. You dreamed that you got drunk, drove and got arrested. Then you went out and got drunk, drove and got arrested. Acting out the dream - drinking and driving, was your own choice. Once you did that, it was only natural for a cop to come along and arrest you. The dream came true because you made it come true.
How far away are you from London? Do you have a fear of traveling on planes?
Money in a dream can represent something valuable, not necessarily money itself, so the credit card dream could mean that you are placing too much value on something in your life, that you are worrying about something to much. It doesn't have to be money that you are worrying about.
You might find these pages helpful:
Accidents in Dreams
Disaster Dreams
Money Dreams