My Principal and Teachers disrespected me when I informed them about my Father's death.How should I cope?

I am currently studying at a University in India ..My father passed away recently (on 20th March) and it happened when I was almost completing my 6 month mandatory internship as a physiotherapist graduate..Since I am the only one left to take care of my mother (who's having health issues as well) i thought of requesting my Principal to pardon my pending 5 days of internship (Note - He has excused people for hurting their nails,spraining ankles and what not -These kids were involved in sports at my University) .So I travelled 400 kms back to my University yesterday and upon reaching immediately went to the principals office and told him my situation upon hearing upon which he states that's not my problem .I told him I have missed out on seeing my father for the last time due to my internship extension and I don't wish the same incase something happens to my mother to which he states it's your fault alone you should have completed the internship on time(I had 1 month extension because I had to rush back home to see my grandmother who had undergone a Bypass for TVD ).When I told him my Mother needs to be checked out as well since she has been fainting since the last 3 weeks he stated that nothing will happen if you wait for another 5 days stop giving excuses about your father and mother ..I need to mention that I have always been sick and missed out on college over the past 4 years due to acute exacerbated asthma for which I have been undergoing steroids based treatments but the people around me especially at the University have always treated me like a bum who's faking it ..I have always diligently submitted my medical files but it seems the Principal doesn't care about my helplessness because I wasn't a model student or represented the University in Sports ..Oh forgot to mention during my final year there was a new Sir who joined our NeuroPhysiotherapy Department who I became close with who informed me that the Principal had informed him and other departments to fail me in any subject if opportunity arises..however I covered my curriculum on my own and managed to overcome this unfairness... Forward it to yesterday and he also claimed that we have been passing you because you as a student are too stupid to clear the exams on your own(I scored a First class percentage) and also I have diligently tried to cover my internship 178 days done with just 5 more to go .I am extremely dejected at being treated like this after being a student here for the last 4.5 years and for having issues in my life I know nobody gives a fuck about in this world except our loved ones but I atleast expected some empathy ..Please guide me on how to overcome this unfair behaviour and where is it that I was wrong as a student .