After not feeling good, or like myself since January, I finally went to the Dr. Doing a search of my symptoms I was assuming that I'd be told I had an iron deficiency. Lyme disease also ran through my mind as my daughter has suffered from it. I had blood tests done last week. My results came back this week and everything came back good except for vitamin D. I was deficient.
Deficiency causes muscle weakness and decreased immunity especially to respiratory infections which was spot on for me.