Babies are so smart! Is it possible that your LO is nursing until it becomes more work to nurse (maybe LO isn't patient enough to work for another letdown), and then starts fussing for a bottle? You're taking it personally and thinking baby isn't getting enough, but MOST babies will go for the fast flow of the bottle vs. the work to get another letdown! That's normal! I still think based on your pumping output that you are meeting the needs of your LO!
Sounds like your doc and ped aren't supportive, but don't let them deter you from your goals. Get new docs or ignore them and do what you know is right for your LO. Many docs don't know a lot about breastfeeding and don't realize the benefits! You're the Mom, not them, you know what's best for your LO!
As far as DH is concerned, I might be off base, but it just sounds like you need to talk and work out some breaks for you!
If you can't get support from anyone, at home or at the docs office, you have lots of mamas here that are in the same boat and can offer tons of support! You are definitely not alone!
Keep up the good work mama! It still sounds like you are doing a great job for your LO!!! Be proud of your accomplishments!!!