What's the diagnose of an unstable bp(low then high mostly at the same time)with the feeling of dizziness,headache,nausea,blurred vision & heaviness.

Need more info: It looks like you have concerns about a complex medical situation. You may want to consult with a doctor with a more detailed review of the problems. You can arrange a one on one consultation here, or see a doctor in person. Diagnosis based on the symptoms you describe would require lots more discussion & depend on the patient (young or old?) the timing (recent or chronic), the triggers, etc.