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That is not likely hydralazine related.
Muscle pain is likely explanation.
Hydralazine is potent vasodilator --will help with your blood pressure.
You can consider physical therapy for muscle pain.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
High blood pressure will cause persistent headaches.
However, aneurysm is a concern given your other medical conditions.
Hence a brain scan should be considered.