Well last week I had stomach flu but it all went away and all that stuff y'all know illnesses. well I also had fever but the fever gets me suddenly and goes away? like it's not even cold and I feel like I have fever cause I get chills and I start shaking from being cold ? What can this be ? Yes I do have anxiety and I start getting nervous cause I keep thinking I have fever when I'm shaking , can y'all help me out please ?