
Hmm. Have you got the post-playday blues?
I can't comment much on your viola, because I've never heard you play, but your flute-playing is coming along really well.

As I've said before, when I heard you warming up at York you sounded really good and I thought I was going to be the dunce of the flute section (and I am, on paper,
supposed to be a more advanced player than you - which means that you shouldn't have been sounding better than me...

).
I think you've probably hit the usual grade 6-ish plateau with your flute playing. A lot of flute players seem to hit a bad patch either before or after grade 6 (and sometimes both...) where they just don't feel like they're getting anywhere. Andante and Bagpuss can probably give more insight into this, but my sense is that it comes from having a better awareness of what flutes are capable of doing and of the fact that you're not (at the moment) achieveing the sound, tone etc that you are wanting. You're now listening for and trying to do things which you weren't even aware of before, and that fact that you can't quite seem to do what you're wanting to
yet can be quite demoralising.
From what I heard at York, you're coming towards the point where an upgraded flute would give you a new lease of life - but I know this probably isn't an option until after you finish your PhD. Try doing more work on your embouchure control, particularly towards the top of the second octave and on the third octave - this will help when you do get a new flute because the beginner's flutes such as your TJ aren't as fussy about what you do with your embouchure. Have fun playing around with how far you can bend/change the pitch of notes using just your embouchure - this will help with control of intonation and dynamics later.
Play some things just for fun.

Perhaps try a piece which you've been wanting to look at for ages but haven't learnt yet, and see if you can suprise your teacher with it.
Hope you start to enjoy your playing again. It would be a shame if you chucked it in when you've been doing so well.

Plateaus are a normal part of learning, and you
can come out the other side. Dawn F recently posted a lovely quote (which I think was originally from either plonkee or pushpull

) about admiring the view froma plateau - perhaps she might be able to find this quote again.