at your numpty of a GP!!
And congratulations on both your baby, and on getting breastfeeding going after a difficult start! That is superb - well done.
It WILL get easier.
My baby wasn't technically prem, but she was 3 weeks early, and averaged a 3oz weekly gain for the first few weeks.
If your baby is ticking the boxes re pooey / wet nappies, alert, weight gain, good colour, happy etc, this is a good indicator of health.
You sound like you are well informed, which is great. You probably know that expressing isn't a great indicator of milk supply, and although it is a learned skill which can improve with practice, some of us are still pants at it, whilst others are milk goddesses...sigh.
Is your "bf counsellor" an "infant feeding co-ordinator" attached to your local hospital? I believe that is what the lactation specialists are now called. If so, tell your paed that you are seeing the infant feeding co-ordinator for support for exclusive breastfeeding, that she supports your intention to exclusively breastfeed and you are not in need of nutritional advice from the paed as that is covered, rather that you wish him to rule out any medical concerns.
Better still, get your bf counsellor to speak to the paed or put in writing that bf is going well, latch is good and so on.
The two hourly feeds may continue for a while, (sorry), but keep telling yourself that this is building your supply and helping your lo to grow - and it is normal, honestly!
Some of us co-sleep with our bubs as it makes night feeding sooo much easier. I know there are guidelines with co-sleeping and prem babies though, so do read up on them if you decide this would help. Try posting on the sleep forum if you are interested.
Are you able to keep seeing your bf counsellor - does she attend a baby cafe or clinic, or something similar that you can go to?