I would suggest milk for the symptoms you're describing.
Btw, several years ago, while doing a vegan diet, I used to eat sprouted lentils. They were not good, and eating more than a handful was a challenge. Not because of the taste, but because my body just didn't like them, as it didn't like any of the other sprouts I was having like soy or alfalfa or (I think, iirc) broccoli. AV claimed any raw sprouts are toxic and will kill you pretty fast if they're all you eat. I don't know if I believe they're that extreme, but I could never eat raw sprouts except in very small portions and mixed with other foods. However, if I cooked them, there was no problem eating large amounts. It makes sense that the seedling would want to protect itself from being eaten at the point in the plant's life where it's the most vulnerable, and so it makes sense that raw sprouts would contain plenty of antinutrients to deter animals from eating them. Otherwise, how would they survive in nature?
It's interesting that you have issues digesting nuts, as AV also said that almost nobody can digest them properly. I certainly find that even if eat a lot of nuts, I feel like I haven't eaten much of anything, even though supposedly their caloric values are quite high.
Re: what you asked about onions, I either slice them very thinly, or chop them, and add them as a condiment to my meat meals, or I grind them up in a patee. Or once in a blue moon I will use them to condiment a salad or a veggie juice. Always in small amounts. The most I can eat in a single meal is one small onion, or half of a large one, and even that is hard sometimes. However, in small amounts, they sometimes add good flavor and there are some valuable nutrients in them, particularly for cleaning certain toxins out of the body. I also alternatively have garlic, ginger, horseradish root and hot peppers in the same ways and for the same reasons.