Daily Headaches Like Migraines For Over A Year

I'm a 15 year old girl and have been having bad headaches like migraines for the past year and a half. At the beginning i would just get a migraine type headache late in the afternoon but it would only last a few hours. Over the past year however they have gotten frequently worse i now get them everyday with symptoms like dizziness, nausea, and heart palpitations. Usually i get the heart palpitations first usually around noon then soon after a pounding headache (it can be anywhere in my head e.g the back, sides, or behind my eyes) then dizziness to the point i fall over and feel like i might faint. In the last month some more symptoms have arose like tension headaches as well as the usual daily migraine, i have trouble swallowing when i eat (for example ill be starving but when i start i suddenly feel too full and it feels like the foods staying in my throat) I also get sharp pains in my head at random times it has gotten so bad sometimes at night i cant sleep on a side of my head because its too painful and that itself causes a headache. Too add to all of that ive been waking up with severe headaches and feeling of constipation. I also cant sleep in anymore because the longer i sleep the worse i feel when i get up. A side note to this is that ive had a minor cold for roughly almost a year i just cant seem to kick the mucus in my throat. I don't know if this could be related. I have gone to a pediatrician about this and have had my blood taken and it came out fine. So my doctor prescribed me to a anti- depressant drug (Elavil) that is supposed to help migraines. At first it seemed to help but now my symptoms have just gotten worse. Im afraid of it getting worse i need some help. Does anyone have any ideas what this could be? or how i could treat it? Could this be related to anxiety or depression?