Have you recently changed the soap/shower gel you're using? I've found in the past that some have made my skin very dry and itchy down there...
Re the lump - I've experienced something similar a few times in the past, but each time it went away after a day or so. The gland explanation sounds about right.
Hope you get to see a GP soon. What is with the "no new patients" line?? It doesn't make any sense...