Frequently feeling anxious. fearof

I think too much over few small as well as big problems am facing in my life. Instead of taking action to resolve issues I am just fearing . Suddenly some thoughts came in back of my mind which are so distraction that I suddenly start feeling my chest heavy and start thinking about it. Sometimes when I am tenses i keep walking and need someone to talk about it. I fear change in life, even though I am not happy with current situation, I feel like things are going to be worst or may be I feel like I need to find another way to fix things again in my life. Sometimes I feel like completely normal and live my life happily bt sometimes when any change occurs I just get panic and start thinking too much, and even lost my appetite. I think I don't care about my health or myself at all. Some of my friends say that I am just creating problems which I agree but don't know how to change my mindset to see better in life.