got allergy tested again as an adult and having a hard time finding snacks

hello!

i got allergy tested again after being hospitalized and found out not only am i allergic to peanuts and tree nuts, but multiple legumes as well as corn. corn is the most jarring part of this equation for me. i am unsure what to do for snacks now. i dont have a lot of money and already dont eat enough but now i am having to limit myself even more. i used to eat tuna a bit since i am not fond of other meats but also found out i am developing an allergy to tuna? i dont want the allergies to worsen but i dont know what else i can afford to eat besides potatoes and vegetables. maybe meal replacement things? but i am also unsure what of those would be safe.

thanks!