Hey Tonya - I am on the 37.5 prescribed phen and I had the worst headaches for the first week or so. I noticed I would get them about the same time every day (around 2pm) so I started taking some ibuprofen about an hour before and that seemed to help curb them. I also didn't know if I would be able to make it...but here I am a month and a half later (and 15 pounds lighter) with no side effects. I suggest you just give it a couple of days and take some pain meds in the meantime. Don't take more than the recommended amount - but I think in time the headaches (and any other side effects) should go away.
Good luck! 
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