Does metoprolol helps with headaches? i have hypertension and was put on metoprolol but was also told it would help my migraine headaches?

Yes: It's often used for migraines and does, in fact, help many.

Could help prevent : 2 beta-blockers are approved by fda for migraine prophylaxis, Propranolol and timolol, so no reason to expect that metoprolol would not do similar control. But there are difficult adverse events, including faintness, exercise intolerance, depression, confusion, asthma, interference with diabetes, etc. If it works, and is tolerated well, you have a proper med.