Hi, I'm 58, diagnosed (finally) at 49. If I had any menopausal symptoms, they got lost in the noise from Sjögren's and hyper POTS, both of which got bad after a bout of mono in my mid-40s, then worse after I had shingles.
Sometimes with hypovolemia, especially if the BP has gone really low or the PP really narrow, the dysautonomic body will overreact and drive up BP and HR.
I've been having a bad spell with BP going low enough the Braun cuff can't read it (I think it just errors below 40). Then, about the time I'm feeling light-headed and pre-syncopal, the adrenaline kicks in, and the roller-coaster ride begins.
Before I was diagnosed, it got really crazy. They kept telling me I was fine, so I'd try to act it. And I was still on a "healthy" low-salt diet (now, I'm on 8g sodium/day), and no meds, and no compression gear. I had BP readings from 230/40 to 285/270 to 32/LO, all within 10 minutes, on one very bad day, the rest of which was spent in bed. (I don't recommend it!)
Things that make it worse for me include: being dehydrated; or running low on sodium; or being too hot or even allergic (surface blood vessels dilate, so the blood-vessel volume goes up but the volume of blood available to fill them can't increase to match, not without time and water and electrolytes); or eating a big or high-carb meal (the guts get greedy when they have digesting to do); or, still, doing too much or resting too infrequently. Any of those can increase my autonomic instability.
Things that help me include a cold drink; more electrolytes (I'm adding a sports electrolyte powder to my drinks); lying down with legs up; small low-carb meals; keeping allergies well-controlled; resting early and often.
I don't know what's causing your rollercoaster BP. Even just being tired can throw mine for a loop.
If you post again, it might help if you give sBP and dBP for each reading you mention. 140/130, 140/70, and 140/40 are very different!
Including HR helps, too: Even if BP is a steady 110/60, the situation is very different with a HR of 240 or 120 or 60 or 30.
Best wishes!