Hi Jenna,
Your headache sounded like what I had a couple of months ago, except mine lasted for a month and a half! The only thing that helped was pred. I tried OTC migraine meds, 2 rx's my rheumy called in, Imitrex gave me chest pains, Maxalt worked sometimes but the Pred worked the best. I've never had headaches like that I don;t care to have another. It was so bad that I ended up missing 3 1/2 days of work, went to the ER and had a CT scan which came back clear (thankfully) and saw a neurologist. I finally determined it was the worst lupus flare I've ever had. My body was racked with inflammation in my joints too! I hope you find some relief soon!
Yes mouth sores are very common. Carol told you about
the magic mouthwash there is also a dental paste you can use and you may want to talk to your doctor about
folic acid. I take 3mg a day and that usually keeps them away unless I am flaring and right now I have 4 in my mouth!
Take care and keep us posted on how you are doing and of course ask more questions if you have them!