I have no interest in anything anymore?

For the past few months I’ve realized that it’s hard for me to be interested in anything anymore. I can’t find new music, new food, new anything because I just don’t have an interest. I struggled with depression pretty badly from the time I was 11 to 15 and was medicated. I haven’t been on anything for a while and I’m too scared to go back on anything. I’m just beginning to feel overwhelmed with loneliness and I get very irritable because of it. I’ve noticed that this feeling hits me in waves too. I feel it all the time but sometimes it just gets worse and I lash out at everyone and then that makes me feel even worse.