Sardines, Tuna, Peanuts, Beans, eggs are all cheap and have high amounts of protein. I'm sorry to hear that you are struggling. There is no shame on getting help. go to the local public assistance office.
Hunger is no joke and can lead to serious health risks including dementia. How you going to be successful in a job interview when your stomach is growling and you in a shytty mood cause you haven't eaten shyt in almost a day.
You got 2 choices. You can let this current struggle destroy you. Or you can change the way you approach things. remember the definition of insanity and build and become a better person. , change is necessary for success.