very extreme and sudden mood swings Possibly bipolar?

I'm a 15 year old girl and I think I may have a mental illness. I go to a psychologist and may go to a psychiatrist in a few months if the homeopathic meds (for mood swings) my psychologist suggested don't work very well.
I have very extreme and sudden mood swings.
I have episodes of depression when I want to cut myself, think about suicide a lot and plan it (I almost did it twice), start overeating and gain weight (then stop eating and lose a lot of weight. I have previously become anorexic and bulimic in such a period.), sleep up o 20 hours a day, am constantly exhausted, etc.
And I have other episodes when I'm euphoric, feel on top of the world, unstoppable, powerful, special, amazing, ... But I also become delusional (I feel like people are constantly watching me and I feel terrified because of it) and hallucinating (usually auditory).
Until a few months ago, I thought I might have some kind of mental illness, but when I told a few people I trust, they said it's just hormones, a phase that will go away. These symptoms first started over 4 years ago, although the hallucinations and delusions only started this year.
I will start on homeopathic meds for the mood swings in a few days, but I don't think there are any for the psychotic symptoms.
What is it possible for me to have? Will homeopathic meds help? Or will I have to take "heavier" meds?
Thank you.