I thought I'm done with anger (and negative emotions generally), but lately they've returned. Around March I grew an interest in Buddhism and decided to embrace this life philosophy in order to live a happier, longer, healtier life. Surprisingly, I managed to control my negative feelings quite good, with very short and weak anger and frustration episodes. Until my mental condition got worse. Since then, I get angry easily and for small things, I even have homicidal desires and get really pissed off on a friend of mine when he doesn't reply to my text message questions or changes the subject during conversation. I'm angry on my mother a lot; I'm not pleased if she shows much interest in my condition, like asking if it'd okay if she entreated me to pay an unplanned visit to the store, but I'm not pleased if she forgets I'm sensitive and starts arguing with me either.
I noticed my speech is much more fast-paced than usual.

What should I do to return to my peaceful lifestyle? Meditation, count to 10 and breath, etc. etc.