Oh sweetie, I am so sorry to hear your having such a hard time.
I think if you have another nosebleed and feel its going on too long, just call 999. Your doctor said go to a&e, well they can flaming well collect you then!
I also really understand the pain your experiencing with SPD, I had chronic SPD with my first and was unable to do anything for most of my pregnancy. I am sure you know all the things to do to avoid making it worse.. but if you feel like you want to see if we were told the same, feel free to PM me. The good news I suppose is that I only had it a little with my 2nd and virtually nothing with this one.. I get the odd twinge, but I really believe the techniques I learnt have prevented it from getting any worse.
Big hugs hon
xx