I worship the sun, so how could I possibly have a vitamin d deficiency?

I am 36 years old and have suffered my whole life with chronic sinus problems (I am extremely allergic to dust, mold, tree pollen, etc.)and seborrheic dermatitis. December of 2008 I dyed my hair for the 1st time. Several months later my scalp was inflamed and extremely irritated.

In addition, I began to have symptoms of irritable bowel syndrome. After several months and countless hours on the internet trying to determine the cause of ALL my problems, I finally went to the Dr. and asked him to run test that summer. He took 4 vials of blood and said they tested my kidneys, liver, thyroid, and vitamin d levels (and also because I requested it he did a "celiac test").

Several days later I was notified that the only thing I tested positive for was a vitamin d deficiency and told me to start taking a multivitamin with at least 1000 IU vitamin d.

I could not believe it - a vitamin d deficiency? I worship the sun. My favorite summertime activity is soaking up the sun. I LOVE IT! Well anyway, I went for a scheduled Dr. apt. last week to check my vitamin d levels again and I still have a vitamin d deficiency. So, he prescribed vitamin d 50,000 units (1 capsule by mouth every week for 8 weeks).

Is this safe? Is it enough? Should I get another opinion?

Please help, I am now more confused than I was a year ago!

Thanks