I'll check Doctor's frequency.
Nubby is expensive because making a new universe is a huge deal. One strategy is to get ten dollar bill (lowers max HP and gives you money), then get nubby, then recover a few times to get some max HP back. Nubby is still a risk though, but that's by design.
Sword and shield was originally multi-use but I found it was pretty overpowered. Getting at least two sword and shields means you can easily play nothing but that item and steamroll enemies. It felt bad to have such an effective strategy based on only spamming a single item.
I'll check tiny band-aid.