Wow, I remember feeling like this when DD2 was just born. I still feel like it occasionally, but not as much.

When it was just me in the evening I would have to read DD1 stories on the couch whilst feeding DD2 and then, either when DD2 had finished, or between sides, take DD1 to bed. Like lots of babies, DD2 cluster fed like crazy in the evening, so I got used to doing lots with a baby attached to me. I tried my best to so some special activities with DD1 most days when DD2 was sleeping.