Anxiety and mental stress. Should i do?

I am riya and am 21 years old..in February i lost my grandmother and after that i was very upset i came back to my college hostel and after sometime i have so many problems at the same time i have urine infection and my periods was late that's why i have so many problems and at that time in some confusion with my bf  i ate some contraceptive pills also but after some time these problem are gone and i have my period also but they are irregular. And after sometime when am having my exams that day in night i feel anxiety and and i was so stressed and i hospitalized but my bp was normal and this anxiety bother me again and that's why i leave the hostel .and when i had the ultrasound then i came to know that am having PCOS and am taking medicine for that but from 3 to 4 days am again having this anxiety problem..am scared to sleep am having negative thoughts that from new places that how i survived alone and how i use to work please help me what should i do