Don't worry or think that what your pain feels like isn't as bad as anyone else's. Altho pain can't be measured, knowing how we have felt when someone describes a particular level or type of pain, it means that we understand how you are feeling.
It certainly does make a difference having someone who tries to help and understand, I've got one like this, and I know I'm lucky to have him as I've not been the easiest person to live with
Will your boyfriend be going with you to see the rheumy?? If not, is there someone else who can go with you, as having someone there for moral support, who can remind you about things you may have forgotten and to help remember what has been said can all help make your appt that bit easier to deal with. Take your "little book of fibro" with you to your appt so you can refer to it if needed or even let the rheumy look at it to try and get a good overview of how things are for you.
WRT the hospital you're going to, have you had a look online to see if there is some sort of map/corridor plan or something similar to give you a general idea of where you need to go for your appt. Would doing something like that help make things a little less daunting?? It's not easy to guess what the rheumy will say and do during the appt as they all seem to have their own approaches. I don't think you'll be told it's in your head or that you're making it up tho. You may have the FM dx confirmed and then be discharged back into the care of a GP. Or you could be referred on for different treatments/therapies/pain management courses/clinics to try and help you with managing your FM, it all comes down to what is available in your area and what the rheumy thinks could be of help to you.
As for a GP, you could ask someone on the admin side of the surgery if there is a GP who deals with or as some experience of treating patients with chronic pain and fatigue conditions. If there is one, it would give you the chance to see the same GP each time which will help with treatment and things as they will know you, your condition, what you've been doing/trying etc etc. As for meds, there are others, stronger than your current ones that can be used in FM. This linky tells you about some of the different types used http://www.nhs.uk/Conditions/Fibromyalg ... tment.aspx
If you went to see your GP with some suggestions for different meds, they may consider giving you something stronger and more effective to try.
I've waffled at you for enough tonight, time for