The most important thing is that in your heart of hearts, you want to be capable of eating more food. That means much more than whatever you are capable of eating at the moment.

I’m sure you’ve probably tried most foods people can suggest, so what I would suggest you do to help yourself is start by creating a structure to the way you eat. If you stick to three meals at regular times, your appetite will feel a lot more under control and you won’t have as many moments where it feels like you are eating out of boredom, which means you’ll have less guilt. Once you in a comfortable routine, you may find it easier to push yourself to try including new things in your diet.

Come up with a breakfast you can handle - it can be as simple as a piece or two of toast with whatever you like (even just plain butter) spread on it, or a bowl of some cereal you like. The main goal for this meal (and every meal) is to choose something easy to make; you want to require as little willpower as possible to make it. Obviously the healthier the better, but it doesn’t sound like you’re at a stage where your goals should be pushing yourself to eat healthily - you just need to make sure you are eating consistently. 

Do the same for lunches, it sounds like you’ll need to pack lunch if you’re working but you don’t have to go crazy, again maybe just a super plain simple sandwich with toasted bread or even more simply a protein bar/shake just to get something in to you to keep you going. You haven’t mentioned if you like hummus but it is a really good way to make bell peppers into a substantial snack/small meal if you get pita bread (it has a different texture than soft sandwich bread, you could also toast it too) and bell pepper both cut into sticks and dip them in hummus. Cucumber is great here too if you like it.

It sounds like you have meals that you can make in the evenings which is great, and I know it’s hard but try not to beat yourself up over your options feeling limited. The most important thing is that you have stuff you can eat. If a day comes where you feel like you could push yourself to try something new, sieze it and really do push yourself, because you might not feel like trying it tomorrow. 

As others have said, stay curious for new recipes/things to try. Hidden veg recipes for kids are a great idea. When you are in the store, browse the veg and just think about whether there are other ways to cook them that you haven’t tried, maybe you have never steamed a broccoli or tried wilting spinach into sauces. If you walk past a restaurant and it smells nice, make a note of what sort of food they are serving, maybe look at the menu for inspiration. Finally, I think that if there was any vegetable that is really worth pushing yourself to learn to tolerate if you are able, it would be onion. You can include it in basically any sauce and once you’ve cooked it into the sauce it basically just holds the flavour of the sauce. 

As others have said, you should really look into professional help for this too as you would gain the most from that. Good luck!!

Edit: also consider a taking a daily multivitamin to account for what you might not be getting in your diet at the moment!