Well it's good you're not anemic, but always leaves your head scratching.
For now, definitely follow up with original GP.
With the NHS, you have to be your own care advocate. They often won't chase you up (unless it is really urgent, but I have had good GPs phone me about random things too, so it all depends), and you have to be a bit of a sticky wicket. Sometimes things move so slow too, so it's annoying. Go back to the GP and see what the next steps are. I often go in with notes and questions written down and take my own notes back, so I don't forget anything.
If you're feeling unwell again, definitely phone 111 for advice or if real bad, go to A&E.