Alot of times when i start majorly worrying about something that is out of my control i try to entertain my mind with other things that are in my control. I have a lump behind my right ear, a lump on my left hand, my tonsiles are always swollen, i have a lump under my chin..and none of it will ever seem to go away with antibiotics. Weird things like that are just i guess a part of life. I wouldnt get all worked up over those things until i knew for sure they were something seriously wrong. I know its a really hard thing to control..anxiety is..I know that for sure. I suffer from it almost every single day. it really sucks and i hate when it happens. I just try to do everything i can when mine happens. The thing thats helped the most for me is praying to God about it, its a very relaxing thing. I also do yoga, maybe get yourself into an outside activity to help occupy your mind.