Hi Dani - I have faced this question a few times - and even before I was officially diagnosed with lupus and "just had fibro" (say that because half the time the fibro causes worse pain, but a lot of doctors don't see it that way). When the pain gets bad and all I can do is sit and cry - its time to go. My rheumatologist and those on call have told me that. They say to take my meds and if I'm still in pain to go to the ER. Unfortunately, I usually get relief for the time while I'm there, but after the pain meds wear off, unless they give me something a little stroner than what I'm taking to take home with me until the flare ends or I can see my rheumy, I feel the same as before I went in a few hours after I get home. However - the good news is I have noticed a big difference in the ER taking my Lupus pain more serious than my fibro pain so I always blame it on the lupus....they will want to take blood to make sure there aren't any problems going on but should try to relieve your pain in the meantime..
So - in any case, if your appointment is Wednesday - and you can't take the pain I would go...I always feel guilty and its natural but I know its not a reasonable feeling. You take care of you - but like Lynwood said - please stay hydrated and also if you do decide to go its best if someone drives you - A) because if they give you medication they won't let you drive home and b) I've overheard doctors literally saying about other patients "oh she drove herself so it can't be that bad"
If its causing you that much distress, I would do what you feel is best and go if you need it - having fibro as well...the longer i try to cope with the pain, the more stressed my body becomes and the worse I get....then it turns into me going to the ER at 2 am because I waited so long...I'm flaring myself-unlike the Wii fit, mine came from being in a wedding...standing in heals for hours then dancing a bit which I knew would cause pain but couldn't bear to not dance with my best friend and my mom - and I just feel for you...I've debated going myself...Lynnwood is right - take care of yourself because if not it could get worse...and that by NO means makes you a drama queen. Lupus and Fibro pain is serious and chronic...I'm 26 and have had 5 major and 4 minor surgeries and would choose the few days/weeks of recovery of that serious pain over the pain of Fibro/Lupus anyday - sometimes its that bad anyway! I will be thinking of you - I truly hope you start to feel better and receive some relief!