@NotHappyJan,
I tried pretty much every vitamin and supplement for about 10 months. Very expensive and alas, no magic pill fix. If your levels are all good overdosing on some of them can make you feel worse. Especially calcium. Lovely heart palpitations with that one and Tamoxifen combined even though it was recommended by the doc that I take it. . I ditched all the supplements a few months ago,
My wake up to work breakfast is two double shot coffees followed by a Berocca chaser. I keep Berocca in my bag and if I get a slump at work, well I have another one for morning tea. Highly doubtful you're going to get that as a medical recommendation, but it seems to work.
Sleep is quite elusive for some time and going to work on 3 or 4 hours became the norm for a while. It does however get better over time. It's taken a while but 14 months past treatment I am averaging a good 5-6 hours straight. Got be thankful for small mercies right?
xoxoxo