Stress and Periods

Whenever I am in school, which is very stressful, I skip and don't have my period at all, but the moment I go home for winter break or summer break starts I get my period again. Is there a health issue at work here I should be worried about since there are months and months of me skipping my period or should I just assume the stress of school is why I am skipping. I know stress has caused other symptoms like hair loss, panic attacks, and almost complete loss of appetite. I am almost finished with this bit of school (before my masters) so hopefully the symptoms will cease when I graduate from this horrible place. I'm just worried about my health since I don't have the money to see a doctor while in school.