Rach, Have you told your doctors about this? Have they ever taken your blood sugar levels (fasting)?
With your infection history, I have to wonder about what is going on. Again, maybe they can check your erythrocyte sedimentation rate.
Nicky, yeah, night sweats can be from an infection too. They usually would happen during the day as well but then people might mistake them for sweating while moving around.
Rach, I'm seriously worried about you in general. Something is not right. And if you have MG ("If," yeah, if as in if doctors could grab a clue in your case), then anything like a long-standing kidney infection will exacerbate MG.
What do you have to do to get real help in England? Die?
Please get someone to help you soon (if they'll respond to you, that is). I'm so sorry you have so much going on. I wish you had a patient rep. that could expedite your care.
Annie