Anxiety? What is this? ?

So I have been having random attacks of anxiety like nervousness n sacredness(is that a word? ) and idk y. A lot of it is cuz Like I feel like I am dreaming or am out of it and like I am always scared for no reason at all. Like nervous or scared about life. This happened about a month ago. But it was finally getting a little bit better then my grandpa got sick. Then my parents started getting stressed and then my bff's dad died so a lot of crap has been happeneing. So I wanna know how I can get thru this anxiety and stop it from making me freaking petrified!!!! Please help! Also if u had experience with this before! Also when does it go away??