At the risk of stating the obvious, in another couple of weeks DD will be much better at "pumping" than any pump, and you can always give her an extra feed instead of pumping. Also, one of the better ways of increasing supply when your baby is feeding well and being the "pump" most of the time is just to squeeze out the last little bits after she has fed - even if you squirt them down the sink or into a flannel. Takes almost no time, and would have much the same effect as pumping.
Please be gentle with you - it may not seem like it, but you are doing a really good job there.