i am on wellbutrin xl....please help me

i have been suffering with anxiety/panic attacks for 8 years now. i used to be on paxil cr and after 3 years i took myself off (it took me a year to do that). Everything was going fine until a month ago and then the anxiety came back with a vengance. my doctor has put me on 150mg of wellbutrin xl and i am scared to death right now. i have had the increased pulse rate as high as 115 beats per minute AT REST, the strangest anixety attacks i have ever felt, uncontrollable crying, mood swings,.....you name it and i am having it. i have read that wellbutrin xl is not good to prescribe for people with anxiety mental disorders....so why did my doctor give this to me and whay am i feeling this way? is this a normal feeling after 5 days? will it eventually go away? i never felt this kind of stuff when i started taking my paxil or during the whole 3 years of being on it....what is going on? can someone please give me some information?

Thanks To Whoever Can Help Me,

Stacey