Your symptoms, unfortunately, do not point to a specific cause. With a normal IVP I think that the problem is not urological. I do not know what blood tests you had that were normal, but I am concerned with your large water intake as you may have literally washed out some of your electrolytes and this may be why you have been having muscle spasms and tingling. Your awakening at night to urinate may simply be due to your large fluid intake. After you have been drinking large amounts for a while, for various reasons you crave water when you cut back, so cut back slowly to the volume that you are comfortable drinking. I think that you should return to your primary care physician or consider an internist in an academic medical center and possibly get an abdominal/pelvic CAT scan with oral and IV contrast.
Certainly, if nothing can be found then an emotional cause needs to be considered, but I am not sure that other causes have been completely ruled-out.
I went to the urologist today and she thinks it might be tiny stones that wasn't picked up by the IVP. She pushed in where I told her the pressure was. She said that is where the large intestine, appendix, and ureter are located. She wants to wait 4 weeks before we do more investigation. The dry mouth and constipation has stopped but my muscles are still twinging and the pressure is still there.
I feel your pain my Texas Brother!
I've had kidney-stones for YEARS, so I know the IVP & CT drill very well.
I'm not sure about your Urologist specifically, but my Urologist has stopped with the IVP's w/contrast. Partly because my type of stones don't show up on X-ray, but partly because of what the contrast actually does to the kidney. Contrast is a liquid, liquid's are processed by the kidney, foreign substance in the kidney, could lead to kidney issues. So, my Urologist doesn't like IVP's w/contrast. But whatever...
Do you know what kind of stones you have (what's the chemical makeup)? Calcium, Calcium Oxalate, Uric Acid, Cystine? There are a few other types, but I listed the most common, with Cystine the least common of that bunch.
The reason I ask is this... I have Cystine stones exclusively, and unless you REALLY know what to look for on an x-ray (IVP w/contrast), you won't see them. They are quite literally, next to invisible. All the other types of stones show up quite well on an IVP (x-ray) and even better on a CT. Ask your Urologist if they sent your last stones to pathology, assuming you saved them and handed them over, of course!