Hi Jan,   I have to really think about how I felt when my internist first checked my vitamin D levels.  I'm glad that I wrote it down here so that I can remember.   I felt really bad!!   It didn't take too long before some of the achy bone pain began to subside.  My body was simply craving vitamin D and needed the boost.  One thing I didn't do right from the beginning was start to supplement with over-the-counter vitamin D at the same time as the prescription.  I wish I had, but my internist didn't think that it would be necessary.  She said that we would transition to OTC after my levels got up.   Finally, my vitamin D levels traveled into the "normal" range which took almost a year.  When I would start to lessen the frequency of the prescription D, I could start to feel it (negatively) in my bones and muscles.   Just recently I retested and now my neurologist and rheumatologist want my serum levels to be higher still.  In fact I wrote about it last week in Vitamin D and Multiple Sclerosis: Where do I stand?    I'm back to taking weekly 50,000IU of prescription vitamin D in addition to daily 5,000IU of otc vitamin D supplements.  Sounds like a lot, but apparently my body needs the extra.   I hope you begin to feel better really quickly.  I understand the type of pain you are experiencing right now.  Not fun at all!!