Anxiety is taking over my life.?

I feel completely drained. For the past 3 months I ve been having really bad anxiety. It sometimes occurs over simple things aswell, like last night I heard ringing in my ears and it wouldn t stop, and I started freaking out about it and crying and I couldn t breathe. It s getting to the point where I don t want to do this anymore. I sometimes get these horrible homicidal thoughts and it scares me so much. I feel like I have so much mental issues and I feel not normal. It might be my anxiety speaking but I don t know. Today I didn t even want to go to school because I was shaken up from last night. I m on medication but it has a very short life span (0.5mg of Xanax). The ringing in my ears has affected me ever since my childhood, but I haven t really been anxious about it until now. My mood changes from "feeling better" to "feeling horrible" instantly sometimes. It s currently 11:09PM and I don t even want to go to sleep due to the ringing often occuring during silence. I really don t want to deal with this anymore, and I feel like I have no purpose in life. I don t do anything, life is boring for me, I barely hangout with friends and it s just appointments almost every week. Any advice??