I would appreciate any feedback on this, as I am confused and wondering what to do! I REALLY NEED HELPFUL ADVICE!
Since I was a child, I have always had bad nervous attacks or I guess you could call it anxiety. On the morning of any holiday, play, or big event in my life I would be so nervous that I would that I would vomit or have a bowel movement, sometime both. Sorry if I am grossing anyone out. 
It did not matter what type of event or fun thing it was, I would become very sick, very shaky, and extremely nervous. I know that it is normal to have butterfiles, but this seems way too extreme. I also would feel very anxious and sick to my stomache as a child if I would feel guilty about something. I would feel so bad that I had to tell on myself to someone. I would feel so guilty that I would constantly think about it until I gave up and told someone, and then would feel better and my stomache would ease up. These things happened in my childhood since age 5 or so.
The symptoms I have been experiencing as a teenager and adult have varied. I still get nervous at big events and holidays, but luckily haven't felt sick enough to vomit. My stomache still hurts and I feel nauseated and have the bowel movements, but no vomit. I still have the guilt problem and will ALWAYS confess to someone how I am feeling, normally my husband. I once thought I may be obsessive compulsive because of the thoughts becoming obsessions, but I do not have any compulsive tendencies or rituals. I panic very easy and since I have been taking Lamictal for my Bipolar Disorder, it has been worse. I can not stand a lot of things going on around me. For example, if I am in a room with 3 adults and 2 children and the kids are being loud and playing, and the adults are all in a conversation but are interrupting eachother and all 3 are trying to talk to me at once, I feel like my head is literally going to fall off, like my brain will explode! Is this normal? Many times I have to tune everyone out or say loudly, HOLD IT! I CAN ONLY LISTEN TO 1 AT A TIME! I have read that a symptom of being bipolar is having a hard time concentrating. I do, but is this extreme?
The thing that has scared me the most and is why I am finally asking for advice is what happened to me yesterday. I have had my license for two or three months now and drive frequently and often at least 25 to 30 minutes by myself. My husband and I was on the way home from a 14 hour trip from Flordia yesterday and we were alternating driving. We were getting ready to start driving through the mountains about an hour before it got dark. I told my husband I would drive for an hour until it got dark and then he would need to drive through the mountains because he has been driving for years. It began to get dark on me and we were looking for a rest stop to switch. The road was very curvy and there were many large tractor trailers around me. I became so nervous that I stared crying, had chest pains, and was almost out of breath because of how nervous I was. My husband told me that I would be okay and that I was doing fine, but it didn't help. I was okay after switching at the rest stop, but it really felt like a panic attack!
The only mental disorder or nerve problem I have ever been tested or treated for is Bipolar Disorder. My question is, what am I experiencing? Is this normal, a part of being bipolar, or perhaps anxiety? If it is anxiety, what should I do, and how do I approach my doctor? Thank you for reading this long post and I hope that someone can help me!