Hey Tammy - Welcome!!!
Lupus isn't the greatest thing to hear but at least you are getting close to an answer. The minute my doctor (GP) suggested Lupus, I thought - YES - that's why I'm tired, that's why I'm sore and the arthritis, omg yes!!! My sister has Lupus too... don't ask me why it never occured to me but I never connected the dots...heck, it takes doctors years... lol. I agree too about getting a rheumy if you don't have one.
You may never get your energy back full force (((sorry)))... We all have bad days - that's just the way it is. Listen to your body and when possible, rest when you need to. I think that if you do push yourself, eventually, you DO have to rest...and then it hurts more... lol.
I'm sure someone will post the link to the Spoon Theory for you - get everyone you want to understand how you are feeling to read it... Even if it doesn't apply to you on a daily basis, I can guarantee that it is exactly how you DO feel some days...lol
Be well and Stay Strong :)
Sands...