They're not exactly protein shakes, but Sustagen or Proform powders are available from the chemist (and in a couple of different flavours, I like just the plain vanilla one), and if I were you, I would talk to the pharmacist about having one of those. My mum got me proform while I was pg, as I was hungry too (and couldn't eat much). You can also sprinkle them on your ice cream . Take care.