I Came Down With Hives Yesterday And They Seem To

I came down with hives yesterday and they seem to have gotten worse even while taking Benadryl. They are covering a good portion of my body from thighs up. In the last two weeks I have taken excedrin and Aleve gelcap for back pain... Neither of which I have taken before) I also used a new shampoo/conditioner last weekend. I've used the same brand just a different type of each product. Went to the med clinic and they seemed pretty sure it wasn't the medicine since I'm not allergic to ibuprophen. Not sure if t is normal for Te hives to get worse before going away while on the allergy medicin.