Ideas for someone with a lot of restrictions

Hello, I am in need of some ideas. I was recently put on sick leave by my doctor, which means I don’t have any revenue for the moment, so I am trying to eat as cheaply as possible to not go through my savings too fast.
I already have a restrictive diet, I am a vegetarian and I am lactose intolerant, eating meat and milk really upset my stomach already, but now, my new medication also does and makes me really nauseous.
I usually eats things like salad, but the balsamic vinegar I use as vinaigrette makes it hard for my stomach and a lot of ready made vinaigrettes use vinegar or dairy so I’ve stopped eating salad for now.
Ive mostly been feeding myself with smoothies in the past few days, but I don’t think a completely liquid diet is a very healthy thing. I also bought nuts since they’re pretty filling, but I really want to find solid foods that I can eat for lunch with my medication.
Anyone got ideas of easy to digest meals that follow my restrictions?

Ideas for someone with a lot of restrictions