Hi RN and welcome to the HW forums
I understand about the inconsistencies with having any disease (I have Crohn's disease and RA).
There are days I feel like I could run a marathon (not many of those lately though ) and days where I am flat out getting out of my own way!
I think (like yourself) that I try and do everything I can while I feel good and then pay for it later. Need to find the balance of doing just enough and not too much.
Also RA causes fatigue on its own, so we have that as well.
Hopefully you get a diagnosis soon and get on the right maintenance meds to give you remission, it might take a while to find the right combination of meds so be patient.
Good luck and keep us posted.