PMS concerns....HELP

Tanya
I have always struggled with my periods ever since I had my first one! (14yrs old!) I am now 21 and they have seem to have got worse! Last month I thought I got off pretty easy because my period only lasted 3 days!!! 3 DAYS that NEVER happens to me! I usually get my period for 7+ days!
I am currently on my period and it is day 3 and i think it is the worst period I had ever! 
I cannot eat anything without feeling nauseas or vomiting my guts up! The only thing that agrees with me strangely is white chocolate and it sucks not being able to have a solid diet!
I have tried so much to help with my really bad periods.
Acupressure, Yoga, Acupuncture!
Hot water bottles, for my back and belly because they hurt so bad!!
Ibruphon or paracetomal and even the pill (which I had the worst reaction to🤒)
I even got tested for an underactive thyroid, or to check if I was low on iron and everything came back normal !!
I am just so tired 24/7 and I have tried so much just to be able to function whilst having my period but absolutely nothing has worked yet and I am running out of options because 7 or more days of the month is wasted on me vomiting, missing college, rolling around in absolute agony, with hot water bottles, and literally being absolutely useless!
I am becoming concerned and i am also afraid to go back to the doctors!!!