Thanks bpcyclist and Ann for the support and suggestions.
I have contacted my psychiatrist about the tiredness again, so I'll see what he says. It's a bit weird.... I've often been tired just from being busy, but on and off I've had periods of extreme tiredness that almost make me feel sick, and I think this is one of those. Frustratingly, I don't sleep well, wake up multiple times a night and struggle to sleep late when I've got the chance. Sleeping late for me is getting up at 8am.

I'm trying to get myself going on doing some art which I haven't done for a while which hopefully will be a bit fulfilling.