Years ago, I had a condition in which I had chronic pain in one of my big toes and I called it gout. Don't know if that's an accurate name, but I severely cut down on my sugary beverage intake and that seems to have cleared it up. I'm still gonna call it gout.
If you gotta avoid alcohol and fructose, then that's great. Many of us are doing this already because that shit's bad for everyone. No idea how to avoid purine though. A quick startpage search should get you started.
Try avoiding foods that have nutrition facts labels on them. This means buying simple ingredients and preparing your own meals. Fresh veggies, fresh meats, fresh fruits (sparingly, I guess, with your condition). Dry nuts and legumes. Calorie surplus (with lots of protein, ideally) on these types of foods means growth, and lifting means much of that growth will be muscle.
Good luck with your gout! Work hard and do your best!