Low B12

I had an anxiety attack a month ago, I went to the ER and they gave me some xanex. The next day i woke up with numbness and tingling in my hands and feet, feeling dreamy like, and slept most of the day, no energy and scared that I was dying, I went to the doctor and they did blood work. Finally after about 2 1/2 weeks it came back and I had low b12 and an ALT level of 55 so they drew more blood and put me on b12 vitamin pills. ALT level was still 55, I just had a ultrasound done and I havn't gotten the results back yet. I was wondering if anyone had these symptoms, since this will be reassuring to me, so I won't think that i'm dying.

Chest pain ( havn't been getting much of this but started getting it bad yesterday)
Vague abdominal pains, in the sides of my stomach, bottom of my stomach ect.
Feeling dream like, feeling like i'm not real, i guess you could call it dizziness though the room never moves or anything.
Pressures in my head (today it has been feeling really funny over my right eye like a pressure that is pushing down, can be in my eye too)
Feeling like i'm going to faint
Tingling in hands or feet, makes me want to scratch my hand.
Trouble staying asleep, and I can't sleep in.
Medicine makes some symptoms go away, but it makes me feel even more dreamy like.
Cold feet
General pain in my left arm, ect.

These symptoms happen to me throughout the day, and the only time that my symptoms are gone away is when I convince myself it's just anxiety, and i'm healthy, and when I get my mind off of the symptoms..(which is increasingly hard to do )

Am I alone??
I'm 17 years old fixing to be 18, I want my life back!!!!!