I'm not at the moment but I did have to exclusively express when ds1 was born as he had a bilateral cleft lip and couldn't get a seal to breastfeed.
I expressed for 10 months so I know how tough it is. 10 months is a long time but it really just became part if my daily routine and those first few weeks or month are the hardest!
Hang in there you are doing a great job and if you have any questions just pm me!
I'm on my phone but there is an exclusive expressers thread on here somewhere and I am part of an exclusive expressers group on Facebook if you want to join (it's private