Need Some Help With This Itch! And What Test I Need To Ask For From Doc!

Need some help! I have suspected that I have a gluten intolerance for awhile now due to my IBS and just not feeling 100%. Well about two weeks ago my whole body started to itch...no rash, no bumps, no visible signs of anything wrong. I ruled out the typical reasons for itching...no change in foods, no change in soap, no change in laundry soaps, no new pets, no bugs in my bed, no new meds....basically nothing had changed in my life. I went to bed fine and woke up the next morning with the most intense itch I have ever had. I dealt with it a week and then went to family doctor as I was itching so much it was embarrassing! She walked in the room and said "so you have the winter itch" which means I have dry skin....umm no my skin is NOT dry. I know what dry skin feels like and looks like and I do not have dry skin. But she said to go home and take short warm (not hot) showers and to start using an intense moisturizing shower wash (like aveeno for eczema) and to use Sarna lotion or again an eczema lotion. So. That is exactly what I did!! I followed her instructions to the letter and now a week later the itch is way worse and I have now developed a rash along with pinhead size bumps on my arms, shoulders, chest, neck, jaw and legs. Every night for two weeks I have stayed up scratching and surfing the web for what I have and to keep my mind off the itch. I used a whole bottle of sarna lotion in less than a week to try and stop the itch....it only gets WORSE!! For the past two nights I have read and read and read about DH and I am convinced that this is what I have!!! And then this morning in while washing my body with my new recommended body wash I realize that it is made with WHEAT AND OATMEAL!!! No wonder I am getting worse if I really have DH!!! I called my doctor today and have an appointment for Monday and I am hoping she will send me for some test....what test do I need to ask for? I plan on going gluten free soon and know that I have to have my test done befor I can go gluten-free. So the sooner I get all the test the better. So basically I need all you wonderful ladies past experience in pointing me in the right direction. I have skipped around this forum and have already picked up a few things but hope for some more guidance in getting my diagnosis!

Thanks for all your help and words already written!!
Jennifer