I’m new to this thread but just caught up in the entire thing and honestly? You need about five things, and one of those five is going to give you the answer, either positively or by total elimination: the ANA, the RF test, a CT scan, an MRI, and a muscle biopsy (possibly just a single needle biopsy) in your weakest side.
You said your ANA didn’t flag anything in March but they were doing it again and the RF. If you saw that your transferrin level was elevated (I’m sorry, OP, but unfortunately no, this wouldn’t explain most of your symptoms - I’ve had about six -osises show up on my blood test when I was already ill with my primary diseases and they meant nothing except that I was badly inflamed), then I assume this means your ANA and RF are back too? I didn’t see you mention them? Were they both normal?
You mentioned about 40 symptoms and out of ALL of them, the only ones I can remember even 10 minutes later because they struck me as fitting together and important are: drooping eye (huge tell for myasthenia gravis), one-sided weakness (MS, ALS - myasthenia gravis causes general weakness), new numbness (MS, arthritis, Lyme), and new fatigue when you said you needed two hours sleep after awake for four (MS, myasthenia, every auto-immune disease known).
The biggest difference is that MS causes central fatigue - this means it can be part of the disease, but often caused by other parts of the disease like sleep disturbance or pain. With myasthenia, it’s peripheral fatigue - it’s caused by a very exact mechanism whereby your body can’t handle acetylcholine correctly, and as a result, your muscles are reaching failing state. Only you know whether your fatigue is coming out of the blue (myasthenia) OR if it comes after you have high levels of pain and sleep disturbance (MS),, iyswim?
That said, l really hope you can push and get the additional tests you need. I know that cold fear one gets of not knowing why these things are happening to you, if they’ll get any better ever, if this is your new normal for ever, or even the fear they may get worse.
You WILL get through this. But. YOU are not wasting the NHS’ time. If you ignored these symptoms now, it would be more and more expensive and difficult to treat. Please don’t feel guilty. You deserve care. You are allowed to be healthy. Good luck, OP.