Influenza is a rather serious disease. It must be treated immediately. You should see a doctor, but if you don't trust a doctor, you can ask for advice on the Internet. When my back hurt, I turned to the Community Clinic Association. I was advised by the Homedics massage chair (go here). My problem was resolved in a fairly short time.
@erica-keel From what I understand (a friend of mine suffered bad to) your move to Cali should be a great help. As @Lateralus suggests, the vit D supplement should help to some degree, but the sun and being out in it is a really great help. Being in the UK my friend never had the luxury of eternal sunlight, but when it was out it helped him soooo much the difference in him was unreal. If you didn't see it you wouldn't believe it.