hi athrawes, well done on establishing bf! Ime you are definatly past the hardest part. 
The not so great news is that there is no set routine that you can expect your baby to settle in to. He may find his own routine, and this may change over time. But there is not one set pattern for all babies, be they bf or ff.
7 weeks is still early days. Your ds still has a small stomach and needs to feed little and often. What,s more he still wants the closeness of being held by you. This is where your sling comes in. Mine saved my sanity in the early days! I know you can feed in some, but not in the one i had, but being able to potter around the house, or go for a walk with him close gave up both what we needed!
I also think this is a great thing about bf. Your baby can feed when he needs to, rather than when the clock dictates. And when if he is suddenly and unexpectedly hungry you aren't caught short, waiting half am hour for a kettle to cool...etc!
Some may suggest ff as an answer. I have nothing against ff, it is definatly better for some people. But please don't expect it to settle him in to a routine. I know some babies do slip in to an ff routine, but it is no guarantee. My ff friend is constantly clock watching, to ensure she has a freshly prepared, and therefore safe bottle ready for the next feed "due" only to fine her ds is not interested. He might then neck two lots at once before bed (and being unexpected this requires and expensive ready made carton. And the hope that there's a clean bottle ready). I guess what i'm trying to say is that all babies (or at least most...there's always one!) are unpredictable. At least with bf you are ready when they are!
I'm going to push the advanteges of bf to you one little bit more...because i don't think you would have come this far if you didn't want to. I'M really sorry if this seems heavy handed. You mention feeling like a cow. You are doing the right thing by getting out etc. Are there any bf groups near you you can go to? I know it's a cliche, but it won't be forever. Try and enjoy the snuggley bf time and mn at the same time Remember that the alternative is trying to occupy your ds while you wash, sterilise and make bottles. Judging each feed correctly (as they must be made up as needed) or having a hungry baby/wasted formula. Never being far from a kettle you can claim for half an hour. Worry over the quantity, timing, temperature and safe mixing of formula. Not to mention possible wind reflux etc associated with ff...
To give you a picture of where i'm at with ds six months. He is still ebf on demand, though we have started blw. Some days he feeds alot, others hardly any. But he now can handle himself better if starting to get hungry, i can normally buy at least half an hour if i need to. He averagely has about four feeds a day, about half am hour a time, though the evening feed is often longer. He wakes for one small feed most nights but we co sleep and now he can roll over it's virtually self service! He's a lovely smiley boy, trying desperatly to crawl so he can get at everything. When he does i'll probably long for the days he was happy in my arms, still, while i mned/read/ watched telly etc!
Sorry for the ramble! You are doing brilliantly! 