Hey hun, you know you can and will get through this. Unfortunally life can be caca at times and your not on your own there but remember that there are always better times to come and they will.
Just one thing about the medication, I would not recommend taking that because my friend who also had an eating disorder died last month because she had been on medication for many years and as a result a brain tumor formed and by the time the found it it was too late. Plus medication only supresses your feelings, you need to talk about them in order to help you deal with them and understand them.
15 years is along time, too long, I really think you deserve to get help, you need it and your life will be so much freer when you are recovered. If you can try and find a therapy place that have therapists that have had personal experinces with eating disorders because the place that I go to all of my therapists are fulling recovered from their ed but know exaclty what i'm going through and understand where i'm coming from, you know so I think thats the better one to go for.
I know it must of been tough to leave your boyfriend but you know yourself whether it was the right thing to do, you love someone for who the are and how they make you feel, you can't love someone because they need you or rely on you, thats not a relationship.
Perhaps for the moment you could think about just taking a break from relationships because really the most important relationship you can have is with yourself and then others can follow.
Learn to love yourself first and then you will be able to love others and you will allow other people to love you, for who you truely are.
Times are though but they will get better, they will but your not alone, your never alone ok.
I hope your day is going well, take good care of yourself

If you make yourself sick it is very very dangerous not only for your throught or anything but you will lose a lot of potassium wich is a substancethat make your heart beat the less you have you are closer and closer to cardiac arrest and it is very dangerous you should consider going to see a dr to talk about it I know it is not easy and if you already did congrat but yu need to get help to stop.. I know I must sound pretty ameture saying htis cause I only ad this for 4 years I am 17 now and well you lived it longer so I can only imagine the caca your going threw so go get help if you can

yours trully ashley-kate