Hi... It appears you are repressing something very deeply in your subconscious mind. The suicidal tendency and violence towards an animal is a result of that struggle. It may be related to abuse, trauma, sexuality, parenting, career, relationship, friendship, etc. but it is very much there and it needs to be addressed. Also, please keep your parents and doctor in loop. They need to know that you have attempted to overdose yourself. You can consult another Psychiatrist if the medication or the treatment is not helping you. It's okay to change the professional, but it is not okay to drop the treatment.
Next Steps
Consult a Psychologist.
Interpersonal Guidance and Counselling using Psychoanalytic Approach is required.
Your parents need to be an integral part of your treatment (parent counselling). It is more important medico-legally, as you are a minor (below 18 yrs of age).
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: nine six seven one three zero three one three four
Website: https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl