I think it would be a good idea and even if you don't go for a test ask for a referral from your school for a Councillor or someone professional who can help you talk through your issues
It sounds like more than just hormones - I strongly advise you to seek professional help. Your OB-Gyn or pediatrician should be able to help you sort out things and get you back on track. Do yourself a favor and see someone right away.
The best thing to do is to talk a professional, in my experience teenaged years are the hardest u have so much hormones and so much on ur plate and it can be difficult and if it is indeed hormones it may develope into serious depression so the best thing to do is to deal with it from early on.
Have a nice day sweetie!