Major controversy in my house regarding weight loss

I have lost 75+ pounds, to date, since October 2008. I have been in a loosing battle of the bulge most of my life. I was in the first year of a new job, and stress levels were building up in me, so I went to my GP and he put me on an anti-depressant. The Zoloft seemed to help for a month or so, then I was not really sure. I began loosing weight, because of stress mostly, and then anxiety began to follow. In April of 2009 I was sent to a Psychiatrist and the ADHD was diagnosed. At this point I had lost around 40 pounds. The Adderall helped immediately with my symptoms, and my journey into this newfound knowledge began.

My wife and I have both had the common thread of weight struggles... Now I apparantly do not have weight control issues.

Key conflict:

1. My wife wants me to admit the Adderall (She calls it "Speed" during these debates) is responsible. Black or White, 1 or 0... I know I can rationalize anything, and I also feel like "Speed" is meant to knock me down, and ADHD is my latest hyper-focus which is cured by a "Magic Pill".

2. I understand that one of the side effects IS appetite loss. I also think that maybe I feel better and I am not self medicating with food. When I feel full I stop eating. Since July of 2009 I starting a walking regiment that I found makes me feel really good afterwards. Walking is now a twice daily routine and totals 20 - 25 miles per week. My wife often joins me for the evening walk, which seems to curb my appetite. There are many nights that I drink 64 ounces of water and 4 or 5 handfuls of peanuts. Sometimes a Lean Pocket or small dinner.

3. I feel my weight loss is contributed to many things, some being a little will power.

I have caused many problems in our relationship, one being a "Real Difficult" time admitting being wrong about something. We have gone through alot in the last year. I understand that her listening to people ask me how I've lost weight over and over get's old, and people do not know what I have put her through in our marriage.

I don't want to prove myself right and her wrong, I just feel that this issue not so "Black and White" as I feel she wants me to admit.

Any thoughts would be appreciated.