Hi,
Welcome to health care magic,
Generally,systolic 125 mmhg and 55 diastolic blood presuure is not considered as a
low BP but in your case you need to find out the cause of your
nausea and giddiness/
dizziness.
Perhaps if the dizziness is not troubling your day to day work, then you may wait for few days. Until then you may take proper hydration and electrolyte balance with some symptomatic antihistamines treatment like betahistidine. Do not panic.
However if the problem is persistent, you should see a doctor at the earliest and get evaluated further. I will suggest you undergo routine blood count,
ESR, blood electrolytes, tests for vestibular (balance) system like electronystagmography or rotation tests to diagnose the cause for dizziness.
Your local physician or GP will know about the test. He/she will can order the test after complete history and thoroughly clinical examination like temperature, pulse, blood pressure which will enable us to arrive a diagnosis.
Regards,