Hey there, I got misdiagnosed then left due to covid and it's rules so only got diagnosed in July, Anal cancer is really rare, so we one of few, I’ve struggled to find chats on it anywhere, I too started with bloodloos etx I got diagnosed stage 4 nodules 2 metastasis 0. 
I had radical Chemoradiotherapy of 2.5 months daily and chemos of 8 hours a time 3 times with a bottle attached twice to drip into me over 4 days, I had a colostomy bag due to the ulcer I also had there, I had 2 5cm tumours and a 5cm mass. Stage 4 being the worst, the condition itself once treated isn't so bad, it's one of the few cancers that can be COMPLETELY cured with treatment, it feel devastating but it's not a death sentence like so many with other devastating cancers. If you want to ask anything ANYTHING please feel free, there’s no shame here xxx