hello there........I too have had some headaches while on the diovan......although I think I have resolved my problem and it wasn't related to the drug........my allergies were the culprit. ZuZu will let you know though that headaches are a known side effect of diovan.....although rare I think. After I cleaned my air filters and 'aired' my home my headaches went away. We get higher allergy symptoms during the winter when our homes are sealed up. Important to keep all air filters changed etc.
It is interesting you mention hot and cold problems. I am experiencing getting very hot and sweating in my sleep. I spend my nights throwing off the covers then getting cold and pulling them back up. It may just be my age - 46 and perimenopause or just heat during the winter making me get hot in my sleep. I have noticed it a lot though since I started on the diovan. Maybe ZuZu can help us with an answer. I really didn't think about the BP med causing or contributing to it. Are your symptoms similiar to mine??
Hope you feel better soon........