2 months in and done bf:(

My baby is 2 months old, I love nursing him, we took him to his appointment and he's only gained 3oz in 2 weeks/ he was born at 37eeeks and 5days weighing 6lbs1oz... He now is 8lbs 9oz but the dr isn't satisfied with his weight gain... I have epilepsy and if I don't get enough sleep I'll have s grandmal seizure so, for 6-7hours at night my husband has been getting up with the baby so that I can get my necessary sleep, we've had wonderful friends who donate frozen BM to us but only enough for a bottle or two at night, then I pump about 2.5oz myself in the morning for the evening stash... His pedi wants us to start supplementing with formula after nursing and for his night bottles, but I know without his constant suckling my supply will most definitely drop and eventually he will only be on formula... I'm so sad that my body isn't making enough of what he needs, it really does break my heart- I've felt how much bonding it's brings us... I love knowing that I am giving him the very best for his body, and now in a way I feel like in failing him, then again he's my baby, I can't let him starve because of my own attachment to breastfeeding... During the day he has 7-8 wet diapers and 3/5 dirty diapers, I thought we were doing so well until our appointment, I've tried mothers tea, I nurse him almost ever hour, we got his tongue tie clipped... I do warm compress, TONS of water... Still not enough I guess. I just needed to vent because it's going to be really hard for me to make the switch to formula eventually, which I know will happen as I start offering formula after nursing sessions... He will not suck as much on me to produce milk because me will be full, which is what he needs, a full tummy... Sorry that I'm rambling, I'm just really hurting. I don't knock mamas who choose formula ever, we all just do the best we can but for me, I chose to nurse my baby, and so I will be very devestated to see that end.