Ice cream, Orange Juice, Sugary Cereal and Milk, Supplement drinks (meal replaces/vitamin shakes) and add Imodium, Potassium supplements, strong wide spec vitamin supplements (at least 100% RDA f Zinc, Phosphorus, Copper, Magnesium) ask in Pharmacy or health food shops, they should be able to advise on specific ones.
And try L-Tyrosine for anxiety (all this is available over the counter)
Currently helping my boyfriend detox from heroin right now and this is the survival kit I've prepared.
As much as you can try too prepare your body, getting in a positive state of mind is the most powerful weapon. Be around positive people, go outside and enjoy the fresh air, try to laugh at things you could before, FORCE a smile if you have to. Make a list of your hopes and dreams and what you want out of life, then kick yourself up the arse and do it. You have to give yourself a little tough love to.