My son is a litter older than yours. His older brother sometimes can babysit the little guy a little bit, thats make my situation a litter easier than your. My older son also once asked us are we still loving him as we spend so much time and care on his young brother. It is a human natural.
We sometime also feel depressed, especially me. I think the main reason is that I feel really tired sometime for not being well sleeped.
When I feel depressed, it only once came to my mind: did we make the right decision to have thi guy? is it worthy by spending so much energy, time, money and sacrificing so much of our own? By knowing that there are two brothers loving and helping each other, espcially in a difficulty time when their parents are away, warm and touch fullfill my heart and all other things will not bother me anymore.
As time flies everything will geting better,it is true. And this is a necessary phase is almost everyones life. It will only make you stronger and we should thank our babies in this thanksgiving season. May god bless you and all parents who are struggling.