Have you ever had your thyroid levels checked? It sounds like you may possibly have hypothyroidism.
Hey there -- I too was recently diagnosed. Sorry to hear the gluten free diet is not helping yet! I went through a transition in mine too. First two weeks, felt GREAT, then the next few weeks I felt terrible... I also have very very low iron - so I'm taking iron pills to correct, which are not pleasant. I bet the diet could help out your hypertension problem. From what I've read & seen online, there is a transistion period - could take up to a year to heal properly. There is a great online forum that I find an excellent resource: http://www.glutenfreeforum.com/
The people on this site seem to know more than the doctors - I would give them a try.
You may have another condition, i'm not sure - i would think your doctors would have seen that at the time of your celiac diagnosis - but I think you need to give the gluten free diet a little more time. Also, you're not getting any hidden gluten are you? No soy sauce, malt flavoring, modified food starch right??? Gluten seems to be everywhere!
It's frustrating & difficult, but it gets better... check out that forum, it's really helped me a ton... let me know how you're feeling!