A.,
I feel your pain,... i really do. i havea few bits of advice for you. some of it you may not be quite ready to hear, but here goes.
I have lived by the book 'what to expect the first year' for all 4 of my kids. they have all been different babies! This will help you, if for nothing else,.. to help you understand your new baby and why he is the way he is.
also, I can't stress this enough, and this is the part i think will be hard to receive - dont walk into your doctors office complaining that your baby wants to be held all the time. all babies want to be held - they've been in your close comfy uterus for 9 months... this world is big, so your doc may dismiss this complaint, as just that, a complaint that you are just not accustomed to how much time babies sneak from our lives. And frankly.. babies are a lot of work, you find new creative ways to do things with one free hand, leaning to one side and back a bit so baby's head doesn't flop backwards when he's up on your shoulder - i can now make a PBJ sandwich with one hand - my husband says it's amazing because my 12 yr old can't seem to keep the peanut butter on the bread with BOTH hands! HA! Go to your doctor with details; does baby have high pitched screams straight away (they don't build into screams, but start off that way)? inconsolable even when you are holding him? is it only when baby lays flat that he's screaming? spitting up a LOT (by that I mean frequency, not necessarily quantity cuz it always looks like more than it really is) pulls in his legs and screams?
My son had acid reflux - i had told my doctor about my suspicion because he fit the classic textbook symptoms to the "t" - she said ok, call if it gets worse - it did, we gave him medication and it did the trick. we still couldn't lay him flat on his back, but i was able to get more than 2-3 oz. in him at a time, his vomiting slowed, his spitting up was less severe, and the high pitched screams almost went away. I can't say he was a dream baby... cuz he's high maintenance (even still) :) But at least he was happier - we didn't see his first smiles until he was about 12 weeks - because he just wasn't happy... he didn't feel well, the acid reflux was painful for him.
also, it's not too early to start practicing some self soothing techniques for him... baby steps though, i wouldn't push him too much at this point, but definitely get a book on this - i see 'happiest baby on the block' recommendd a lot, though, I have not had personal experience with this so see what somebody else says.
I agree that your situation is a stressful one - i was doing the zombie walk for a whole year with my son (while pregnant mind you).
So to recap... read that book i told you about - it's really like a reference book than an actualy 'read' so you can read as little or as much as you want in a sitting and get what you need from it. Get a good, highly recommended sleep book, and learn to communicate with your pediatrician - they see a LOT of patients - he/she is busy and so you need to be more concise, with details. she's not likely to take 30 minutes to discuss and troubleshoot with you... my last appt with my ped., i got about 7 minutes of her time... how long did your appt. last?
Anyway, I do apologize if I have sounded harsh... I truly do not mean to... I wish I could come by myself and see what you're experiencing... to help guide you.
you and your boyfriend will experience such a tremendous change in your relationship... you will find your way back to eachother if you're committed... but understand this new little person needs you both... and his needs have to be met. I hope you find balance there.
best of luck to you... feel free to PM me - i'm no expert, but i have had 4 very different kids and they've given me a lot of experience.