Dizziness on standing suggests postural (orthostatic) hypotension; dizziness when turning in bed can suggest BPPV(positional vertigo).
Cough may be a separate issue, but dehydration, infection, or medications can contribute to dizziness.
Next Steps
Check BP and pulse lying down and after standing.
Health Tips
Rise slowly from lying/sitting and avoid sudden position changes.
Urgent care if fainting, chest pain, severe headache, breathing difficulty, weakness/numbness, confusion, or difficulty speaking/walking.