I thought I'd update this thread.
So since I last posted, from around the end of March my sleep improved. I was sleeping through more nights than not and this waking up in the middle of the night seemed to end. I didn't really change my diet or anything, if anything I have and am still trying to decrease my overall sugar intake. So that's almost two months of much better sleep patterns, at least they were less erratic.
But now for the past 4/5 nights it's back! On Monday I woke up at 2am, the next night again at 230am, last night at 215am and so on after just an hour or two of sleep. And it's that wide awake feeling where I cannot get back to sleep. Eventually I do get back to sleep around 5am and manage to sleep for a few hours so thankfully I'm not too sleep deprived and still feel largely well rested.
Anyway this is frustrating. I do have alot of worries and frustrations at the moment but like I said before I've had these for many years. Also although I do have a fairly large tea/coffee intake every day, I haven't changed this intake so it can't be my diet. No other symptoms really. Urination patterns more or less normal, no tiredness, hunger, thirst etc.
So why am I sleeping well for weeks and then suddenly not sleeping well again with the middle of the night insomnia returning?