I really need help..

I need some tips because, Im starting to fall into my depression again and Im developing anxiety which unfortunately is making its way into my dreams. I would love some tips on how to relieve stress and body positivity and all that stuff. Basically what makes you happy when you have anxiety and depression. Im 17 and Ive never talked to parents about this because I dont trust anyone but my best friend and my boy friend. Thank you so much guys.