Thanks for all the replies, really appreciate it.
I've been on since January - upped the dosage to 100mg couple of weeks ago.
It worked fine, all the usual 'ticky' stuff dropped off after a few weeks, but since I've come back from a festival in Feb, I've dropped like a stone. I didn't really 'feel' depressed previously, I was taking it for anxiety, but now I feel absolutely flat. Not suicidal, not like that, just absolutely no energy, no drive, no go in me.