People on forums have reported having withdrawal symptoms for over a year. It really does vary. Things like good diet, exercise, sleep, and some supplements promote neuroplasticity and healing in general. As to my diet I stick to brown rice, quinoa, vegatables, fruits, nuts (almonds, cashews, walnuts), and sources of lean protein.

I honestly eat basically the same thing every day as I then do not have to exert any effort finding something to eat. Specifically, breakfast is oatmeal with cinnamon, walnuts, honey, frozen berries or peaches, and protein isolates to drink. Lunch is brown rice with some soup I cook about once a week (basically whatever vegatables I feel like eating (lots of green ones) with spices, almonds, walnuts, and egg whites simmered for ~8 min). I store the cooked soup and brown rice (with cinnamon mixed in it) ready to eat in the fridge. Dish a portion, heat in microwave, and eat. Dinner is quinoa, with vegatables spiced and sautéed in coconut oil, with a lean protein source. I have some fresh fruit, nuts, or real fruit juice as snacks or with meals. I'm also fond of Greek yogurt.

The withdrawal I've been experiencing since April has been brutal and eating like this has made it easier to cope as there's far less stress involved. It also has the benefit of providing all of my nutritional needs. I supplement some vitamins and minerals based upon the level of stress and instability I'm experiencing. High levels of psychological and physiological stress tend to deplete them faster than normal, quite often faster than is practical to make up for. It's best to get them all from food for many reasons, but I also have been experiencing GI issues, and this affects how well I can absorb nutrients from foods.