Whatever this is the symptom seems to be urinary retention. I think for most people the retention stops peeing completely and that is a very serious problem so straight to A and E. For me I could just about pee sometimes it was almost a normal amount but I still needed to pee half an hour later.
Because I could just about pee it took four days between the onset of the problem and finally getting treatment. NHS111 and my GP were fine, the GP said you need a catheter go to A and E.
A and E was a very poor service, four hour wait as to be expected. A doctor came to see me I said I could just about pee and he said well I'm not putting a catheter in if you can still pee. There was some talk of a bladder scanner but apparently that was broken. About an hour later two nurses turned up having found a scanner, my bladder had 500ml according to the scanner in so it clearly was retaining. Another hour later two nurses turned up to put a catheter in. This drained in to a bag after a little while it was nearly full, so after finding a nurse it was taken off and another one attached, the nurse wrote on my records 440ml which was the contents of the first bag. I then filled the second bag and a third was put on which just filled slowly. I asked why she had written 440ml on my records, she said "that was the contents of the first bag", I said "what about the second?", she said "we have to write the contents of the first bag". I actually think they are supposed to write the amount of retention which for me was about 900ml, but I think she had misunderstood her training.
Anyway retention can damage your kidneys, I think you have had it a while I don't think an 8 week wait is a good idea. You can buy Tamsulosin over the counter branded as "Flowmax" if you want to try it and see if it works (it didn't for me). I would seriously think about getting to A and E or finding the local NHS continence service, to whom I believe you can self refer, and they should be able to do a bladder scan and fit a catheter if needed.
I don't think you should let them fob you off just because you can pee a little.