Hi T. -
Not meaning to be glib here, but if I had a circumcision last Tuesday, I'd be pretty on edge for at least a couple more weeks. Many people, including doctors, feel that boys will bounce back from this traumatic surgical event quickly, but some don't...some take more time, especially if they're in pain or if they're possibly infected. I had my son circumcised while we were still in post-delivery, so I think with the newness of birth, it was just another wild experience for him. Getting circumcised at one month after being comforted with breastfeeding must be that much more harrowing because you son is more cognizant.
That's the other point I wanted to bring up, some babies don't take too well to an abrupt change in their feeding methods/schedules. Again, imagine as an adult if you LOVED sweets and then you were all of a sudden directed not to ingest anymore because you were diagnosed with diabetes (this happened to my brother) - not fun at all. For a baby who doesn't know any better, this could be pretty life-altering. Of course, with your treatments, you don't have any other choice but to have some patience until he gets completely used to the bottle. Trust me, it's a food supply...he will. :)
Understanding your need to rest especially with your treatments, I agree with the last response, get a hands-free baby sling. Baby Bjorns are fantastic and comfortable for both Mommy and baby...they are a bit pricey, but worth every bit of the investment. There are cheaper models out there, but you want to make sure that whatever you choose has solid back support for you. As your son gets older, he won't need or even want to be in the sling...he'll want to stretch out in his own space.
There's no need to feel guilty about placing major changes on your son within such a short span of time...that's just life. Now, you need to just comfort him when HE needs to be comforted and have a little patience. He's still just one month and trust me, after just a few more months, he won't be needing you to comfort him as much as you need him to cuddle with.
One last point, and I agree with others here in this forum, you CANNOT spoil a newborn. You can spoil a toddler, a young child, a teenager, and even an adult by always giving into their "neediness" upon their insistence, but you CANNOT spoil a newborn. I'm so irritated that this wives tale is still circulating around. Holding them at this age is part of the bonding process. Also, many studies show that regular human touch is essential to building a baby's confidence level. When a baby has confidence, the world is his/her oyster.
Keep us posted. Blessings to you and yours!