With the additional information - if the GP didn't request the blood test it is not surprising that they don't know about it. Results should be notified to the requesting dr.
There are guidelines from the Royal College of Pathologists (pathologists also deal with lab tests, not just autopsies or looking at biopsies) about the level of results that should trigger an alert.
They suggest that only Hb less than 50 should be notified urgently to the referrer, and Hb below 70 to be notified ONLY if normocytic + normochromic i.e. the rest of the tests do not suggest that it is iron deficiency that has caused this (the OP's case appears to be likely iron deficiency), so no-one in the lab is being careless either.
There is a lot of talk about transfusion, but even for GPs, things have changed hugesly since they were doing the part of their training that was in hospital : I can remember being told when I started training that we should transfuse until Hb reached 100, then 80, and now there is no specific level (in fact in some situations there is evidence that transfusing above 80 can cause harm.
OP, unless you are much more unwell, I'd get some iron tablets and some vitamin C (helps iron absorption) and contact the dept that took the bloods after the weekend.