Thanks for providing additional information.
Normal blood pressure is 120/80 mm Hg and pulse rate is 60-100 bpm.
So his blood pressure and pulse rate should be considered fine.
However as he has nausea,dizziness,headache so these symptoms suggest the possible differential diagnosis like Inner Ear inflammation,Stomach infection,blood pressure fluctuation while changing position,Dehydration,Anemia,Low blood sugar levels.
So he should try OTC Meclizine and Motrin.
Drink plenty of fluids.
And now as he is feeling shortness of breath so if it's not related to Asthma then it's good to see your family doctor for a physical exam.
Further blood check up like CBC,ESR,Serum electrolyte,Urinalysis,Stool routine should be advised.
Hope this helps.
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