ADHD cannot focus. Plz i will be very!

I am not able to foucs on my studies I am too dependent on my friend I dont study unless she teach me she give me work then only i can study i only study 15 min and waste 1or 2 hours wandering around for no use i am medical student studying 15 min is not enough and already failed each college test i am not able to foucs I eat a lot of chocolate whenever i am depressed and other food it helps me and i am too often depressed about my weight and studies i am 108 kg and 21 year old I try doing it but i only do it for 1 day and Thts it nor more than that bext day i eat more than that I think i have ADHD plzz help me out i can't consult a physiatrist because my parents wont allow and cannot even pay this because its my dad who has to pay and plzz i will be very thankful if u give me a proper guidance and if i have it which medicine to take and when Thank you