Welcome to the site. The issue of headaches has cropped up before but, as Bob said, although it certainly looks as if there might be a link nothing conclusive has been proved just yet. If there is a connection I suspect it may be something at the vascular level.
Have you tried any other over the counter pain relief medication? Personally, absolutely nothing
works for me except for co-codamol, (paracetamol and codeine), so maybe trying some different formulations might help – although always in consultation with your doctor in case it interacts with your prescription medication.
Headaches are listed among the side effects of Betaseron, and count as one of the " flu like symptoms complex" listed on the prescribing information, (which can be found on this link http://berlex.bayerhealthcare.com/html/ ... ron_PI.pdf
Deciding whether to tell people about your diagnosis is entirely a personal choice: sometimes it feels good to be able to fight against other people's ignorance and spread a little bit of knowledge; other times you just feel too damn tired to bother explaining for the 100th time.