Erratic Hypertension-Hypotension

Hi, I'm new and hoping to get some insight into why I'm having some BP issues while my doctor is on vacation (next 2 weeks) .
A little back ground. I'm 58.  Have very little stress (new puppy LOL), overweight but exercise 5 x's week, & have always had very good BP (typical 111/73 type).  Family history of very high cholesterol.  About 6 months ago mine went from 240 to 290 (tried diff. meds, none work). I drink about 8 oz of red wine daily from late afternoon until bedtime & try to drink 32 or more oz. water each day.
Ok, so, over the last month I'll be feeling great & suddenly get extremely light-headed. This has happened about 6 times lasting 1-2 days. Last week I got a serious nosebleed (1st & only one in 5+ years), it just started running - no dryness, cleaning, sinus etc. I couldn't stop it for almost 1 hour. It was then my husband mentioned BP.  So I started monitoring & I'm getting huge fluctuations running like 167/103 then 1 hour later it's 92/61.  Several times diastolic has been higher like 115/127 followed by something like 111/76 or 149/98.  These can all be within the course of 1/2 a day. Very erratic.    
I saw my doctor 3 days ago.  He has been treating me since Feb. for a pain in my kidney that radiates under the hip into the groin area (ultrasound showed no stones).  He now believes the pain could be from a herniated disk.  The BP fluctuation- 150/99 at exam (1/2 hr earlier my home monitor showed 149/99 so it's pretty accurate) anyway, the fluctuation has my MD puzzled. He did an EKG-(good) and a Glucose-110 (after eating). I don't know what they're for but now he's ordered these tests...
Comp Metabolic Panel w/eGFR -
a UA Compete Reflex to Culture-
a Uric Acid -
Serum and Urine Osmolality and
a 24 hour Urine for UMA & Metanephrine test.
Dr. said while he's gone if the BP goes above 160 to go to urgent care. It's done that twice now but before I can get ready it's back down to normal so I haven't gone. Urgent Care would think I'm nuts if I go in with normal BP, LOL.
These weird jumps has me feeling bad.  Does Anyone have a clue what's going on?

[Encephalomalcia]

Do you also have a high heart rate when these blood pressure episodes happen?  Monitor your heart rate also during the daytime to see what it is.  If your BP goes up again, you should go to urgent care as your doctor said.  Not to alarm you, but this could be an Adrenal gland tumor, especially if you are also having a fast heart rate.  There are many other conditions that can cause the high blood pressure spikes, but when you say that you are also having pain the kidney it is suspicious.  

[hyrkat]

Thank you for replying.   I don't think my heart pulse rate would be considered "fast" but then again I don't really know what an "average" pulse rate is.    Here's a few examples....158/99-102 or 107/84-103 or 139/77-75.  So far today it's been great at 112/77-74 or 116/83-99.
My MD did mention doing an adrenal test.  I think that's the Metanephrine test.  

[hyrkat]

You mentioned there are other conditions that could cause these spikes.   What might those be?  I'm really not one to stress but I think I would rather be thinking of something other than an adrenal tumor... LOL    Besides, wouldn't the ultrasound of the kidney and liver my DR had me do 3 months ago have shown a tumor if there was one?