Without going into too much detail, it turns out that charity fundraising is the kind of job where you see the worst of people. Even indoors, non-chugging behaviour fundraising causes the general public to react with disgust and anger, and it wore me down. A particularly horrible person stopped to berate me and share his awful views, and I realised that I just could not do the job. My team leader told me that, yes, you get people like that sometimes.
It was an experience, and I will never look at any fundraiser the same way again; I already have an article planned about the way people treat you as a fundraiser, so look out for that for further details. I was feeling very low for a couple of days, but I'm determined to get back on track and be productive.