The addiction is what changes your brain to think that achieving sobriety would bring "hopelessness." I'll second what Dee74 said; that kind of thought is to be challenged. Is it a feeling, or a fact? When do think you would really have more hope that things would go well for you, in intoxication or in sobriety?
One practical suggestion might be to join a class somewhere, as a way of being entertained, a way of increasing your social circles, your sense of empowerment and achievement, and your accountability. This can be really inexpensive. You could audit a course at a local community college, or take a class offered at a museum or some kind of civic society. Learn a foreign language. Anything, basically. I know you said you had ADHD, but remember, you'd be taking the class for your mental health, not so much for the grades. ;-)