I have been on Wellbutrin SR for 1 year now. 100mg once in the m...

I have been on Wellbutrin SR for 1 year now. 100mg once in the morning. Have had 18-20 lb. weight gain, more anxiety(take alprazolam at night to help me sleep due to anxiety).I also at times hear a faint "door bell ringing" and am very short tempered towards my family.. Massive insomnia. I am trying to wean off and start over, but am experiencing major heart palpitations/anxiety along with alot more sleep issues. I don't know if my weight gain if from wellbutrin or alprazolam? My doctor said it was neither and it was because i'm in my 40's now. Wrong!!!!!!!!!!!!! Something is not right.