I hate fueling your worry, but you do have some valid reasons for concern here (headaches, BP around 140/90, seeing spots, upper back/chest pain). It's frustrating, but not all healthcare providers are educated enough about pre-eclampsia and HELLP syndrome. I too had called a nurse line when I was having the upper right quadrant pain, and they assured me it was heartburn. I'm very blessed that my son hung on long enough for the accurate diagnosis of severe pre-e & HELLP syndrome.
Ask for your urine to be tested for protein (that's half the diagnostic criteria for pre-e). Blood tests can rule out HELLP. If both those reveal no issues, maybe ask if you could have some medication to lower your BP. You don't have to have swelling to have severe pre-e, although it is common. I did not swell until after my delivery. Bedrest can help BP, but is not a cure-all for pre-eclampsia, unfortunately.
I hope you get this checked out and all is ok, at least you'll have peace of mind.
Miscarriage Feb 05 & Dec 07
Daniel born Feb 09 at 27w5d, 1 lb 1 oz/12 inches (severe IUGR) due to Severe Pre-E & HELLP. Now tall for age and no complications.
Diagnosed with MTHFR
Cornual Ectopic miscarriage Mar 11
Natalie born 6-5-12 at full term, 7 lb 11 oz & 21.5 inches, progesterone 2-8 weeks (for suspected luteal phase defect), lovenox 6-29 weeks, lda 0-36 weeks, folic.