How long can you stay dehyrdated without complications

I really think that I am dehydrated. I am having leg cramps, my lips are really dry, and my urine is really concentrated (and stinky!). I try so hard to get in all my fluids, but it just isn't working. I can't seem to do it. I see my surgeon in a week and was wondering if I can just hold off until then, or will I be causing permanent damage to my body? What kind of damage can happen if I stay dehydrated for too long? Should I start to worry? I am one year post op and down 126 pounds. Thanks all!

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