My sister in law is angry and ignoring me?

I have anxiety and i hate being ignnored i feel like im sick. My sis in law got mad at me and i dont think shes ever gonna forgive me my question is how do u deal with the pain? its killing me and the worst part is sunday is the last day until i go back to san diego? what can i do to get rid of the anxiety people im serious i literally feel like im gonna have a panic attack