I actually managed some sleep last night. I couldn't get any at all yesterday and my eyes were so tired last night after about 36 hours without sleep. The wired feeling seems to have died down for the time being and I feel less jittery than yesterday.
I'm feeling slightly nauseous now but I don't know if that's a side effect of the tablets or just because I'm not eating properly at the moment. I just don't feel like it. I still can't switch off and keep drifting back to work and mulling over everything that needs doing now and over the next few weeks/months and instead of seeing them as individual tasks I see them as one big task that seems impossible to achieve.
I was supposed to restart my diet this week but I felt that was probably a bad idea on top of everything else.