Make sure you are not getting cross contamination of gluten/soy from other sources. Eg, shampoo/toothpaste/any other supplements or even from other people you live with.
Then, add in some protein. The price of that whey will buy a lot of cans of fish or fresh eggs. Don't worry about the fish being canned or whether the eggs are organic. Do worry about whether they contain any additives or allergens - assume 'vegetable oil' means soy and you need to stay away from it. At this stage you just need to get up to a basic level of better functioning, then you can get a job and afford the better quality stuff. Do see if there is a way you can get some meat for protein. Don't be too fussy - you may be able to get some of the cheaper cuts closer to their use by when they reduce the price.
I also have a GI condition and suffer inflammation that causes joints to ache etc. I know what it is like to lie there and feel as if every cell in your body aches. People who don't feel that almost every day have no idea what it is like.
Whilst green leafy things are good for nutrition, the fact is for people with a GI issue they can be really irritating. Don't force yourself to take those if they make your gut worse. If your gut is bad you don't absorb as much of the nutrition anyway, so reducing that should always a high priority. Choose cheap vegies that sit well with your gut. Carrots, Butternut, sweet potato are all good filling and nutritious. Avocados are often expensive, so maybe spend some of that money on protein.
Keep your spirits up. It takes four days for a glutening to start to to get out of my system. For other people it can take longer. Keep away from the allergens for long enough to really see an impact. Congratulations on taking steps to mend your health through diet. You can get your life back.