Hair loss what could be the cause please help????

I am a 22 year old girl…and i am lossing my hair please help?!
i just moved to Florida i used to live in Pennsylvania, and i have had alot on my mind like getting a job and feeding my animals and plus its the first time ive ever lived away from my mom but i dont know if that could be a cause. but also i havent been eating alot cause we are low on money so we dont have much to eat besides like noodles bread and some canned foods. so i dont have a good food intake im affraid i dont know what kind of job to get so i dont know anymore. my cousin told me it can because by stress and not eating good. i also changed my hair conditioner to Garnier fructis Sleek and shine but they say that cant be the cause its just making me really depressed cause i notice my hair is thin all over not like in men just in one spot its thin through out the whole head i just dont understand anymore if you can help me on what you think is the problem, and what i can do to fix it please do thank you…
? do you know if there is anything i can take from a health food store or anything
i dont take medication and i dont have much to eat so thats proable it…and the stress…