Why is Wellbutrin not showing its effects any more in a depression patient?

Hello doctor,

I am 28 years old with height 5'8", weight 264 pounds, and married. I have been suffering from anxiety and depression for the past 12 years. One day I was driving to college and suddenly got a panic attack all of a sudden for the first time. I was really scared and thought I would die. I thought there was something wrong with my brain, so I had thousands of tests and then brain MRI. All was perfect. During that time, I weighed 170 pounds. I was so scared that I was totally on the bed for two years. I gained 88 pounds in a year by eating all day. I was scared, fearful, and depressed. I tried lots of medicines, but nothing helped. Then a GP suggested me Cipralex and Xanax 1 mg twice a day. Things started getting a little better. Then I decided to lose weight. I lost 121 pounds in two years. At that time I was almost 20 years old. I left the university because I was not able to focus. My father is an industrialist, so I joined him and worked very well for three years. When I was 23 years, I was better enough to make friends. I used to hangout and started taking alcohol weekly. I started enjoying alcohol, and the effects of Cipralex were going away with time. After a year or so, I went into depression mode again. Then I consulted a psychiatrist and he put me on Wellbutrin XL 300 mg, Seroxat CR 25 mg, Xanan 1 mg thrice a day and Rivotril thrice a day. After a few weeks the honeymoon period of Wellbutrin kicked in and the life changed. I was focused and powerful. I just did whatever I wanted to. I started earning money. I mean my dad was happy from my work so he used to give me enough to enjoy life. I became an alcoholic. I got married two years back and have a son now. I used to drink all day long even in the breakfast. I build so much tolerance that I would drink two bottles of vodka every day and night, and 15 cans of beer in a day. My weight has again gone back to 264 pounds. By the time I increased my Wellbutrin dosage to 600 mg per day on my own to get that honeymoon effect back, but nothing changed. It is now all where it started, lying on my bed, panicked, fearful and depressed for the past 10 days. I left alcohol 10 days back cold turkey. I had an LFT test and the GGT was around 700. I just do not want to die of liver cirrhosis. I also had a CBC test and it was 99 percent normal as well. Hepatitis B and C are negative. I had an ultrasound abdomen four months back and at that time, all of the organs were fine except a little fatty liver. Now all I want is to restart my life. I just want that Wellbutrin feeling back. I have build tolerance to Wellbutrin, so it does not work anymore. I just want to restart life. I want to enjoy with my wife and son. I want to go to work the same way I used to when I lost weight. You can understand well. I have increased the dosage of Benzodiazepine all by myself to cope with withdrawalsymptoms of alcohol. Currently I am on Wellbutrin Xl 600mg, Seroxat CR 25 mg, Xanan 1 mg four to five times, and Rivotril 0.5 mg four to five times.