Hi Susanne
I'm so sorry to hear that you have succumbed to GCA after 5 years with PMR - what a blow.
As for whether your night sweats are "a symptom of GCA or the high level of Preds", the answer really is both! Pre-GCA diagnosis I used to wake up in the middle of the nigh soaked in sweat, obviously a low grade fever, and this is a fairly common symptom of GCA. Once on 40mgs of Pred, the night sweats improved but were replaced by sudden surges of sweating during the day, weirdly very often in the middle of a meal. At the time, I put this down to the high Pred dose, and I have heard many others complain of this Pred side effect since. If you drink coffee, it can help if you cut it down or even out, I gave up all caffeinated drinks, including tea. Alcohol can also aggravate the situation.
As for feeling "shaky, weak and slightly removed from the world", that sums up exactly how I felt, and only the other day I answered someone here saying that I lost a lot of crockery due to the shakes at the time. I also lost all ability to concentrate and felt very emotional over nothing.
I hope it helps to reassure you when I say that all these side effects improved as I reduced the steroid dose. Just keep telling yourself that horrid as they are, the pills are protecting your eyesight and reducing the inflammation in your body to prevent more serious events.
We always feel very concerned for those who have to continue working with this illness, especially as our bodies need as much rest as they can get in the early days, and it is vital that we avoid as much stress as possible - PMR loves stress. Those we come across with GCA in particular have found it necessary to take time off whilst the steroids do their job of controlling the inflammation, and then return to work on a part-time basis initially. The more you do, the more difficult it will be to successfully reduce the steroid dose.
By the way, whereabouts in Surrey? I'm on the border, in Ashford, and, if you are interested, organise a support group that meets in the Chertsey area every two months. A lovely bunch of people who will give you a big welcome if you would like to come along and share experiences at any time. At our February meeting we will have a speaker on Nordic walking - walking with poles can be particularly helpful to those sufferers with PMR who have found their balance affected, and can help to offset the osteoporosis risk from the steroids.
I do hope you will soon start to feel much better as the steroids stabilise the inflammation.