This is Dr Basu, Experienced Specialist.
I am here to address your concerns and provide great service.
These symptoms are indeed not that common.
That means we need delve into elsewhere to find the possible reason.
Most important one is autoimmune
Vasculitis or inflammation of the blood vessels can cause low blood pressure, and also purplish discoloration of the hands.
Raynaud's phenomenon, CREST syndrome, Polyarteritis nodosa, or small vessel vasculitis for examples.
Ideally, a biopsy of the nailbed will be helpful.
Blood tests to look for autoantibodies should be ordered --ANA titers, ANCAs, anti Jo1, anti RNP antibodies
Also a digital angiogram to look for vessel inflammation.
Next possibility can be endocrinal problem.
1. Adrenal gland insufficiency
First you should consult with a rheumatologist and a vascular surgeon.
Thank you for sharing your concerns with us today. If you have any additional questions or need further clarifications, please do not hesitate to ask. I am here to answer them. I wish you good health. Regards, ***** *****