Welcome to the forums. I'm glad you've found us.
No, you are not paranoid. Not even a little. Numbers like that appearing for the first time after 20 weeks of gestation are likely to mean that you're experiencing the early stages of the umbrella condition we call preeclampsia. It's great that they're controlled with meds right now, but the disease is could still be progressing in the background and you'll want to stay vigilant for any progression of symptoms. 50% of women with new hypertension before 32 weeks develop preeclampsia (I say "probably" because sometimes it's unmasked chronic hypertension that never progresses to clinical disease, not even postpartum) and those are *high* spikes.
In your shoes I would want to be tracking and logging your pressures at home, running frequent 24-hour urinalyses, and following up on any new symptoms.
Technically, swelling has been removed from the diagnostic criteria for preeclampsia, because pregnancy swelling is weird stuff and women with normal pregnancy can have crazy swelling. But in someone who's already a severe gestational hypertensive, swelling like you're reporting is worrisome.
You're in the UK, right? Here's a link to PRECOG, the care guidelines that should be in play for you now that your pressures are so high: http://www.bmj.com/content/330/7491/576.full