Just print out a sign that is 20 x 20", with black lettering on a fuchsia background saying "PLEASE DON'T HARASS ME FOR NOT WEARING A MASK, I HAVE A MEDICAL CONDITION!!!" and stick it on top of your head. Done.For me, wearing a mask for more than five minutes is a pain. After a short period when I feel some kind of weariness, I start to feel myself dizzy, and at around 15 minutes into wearing it's a vertigo. How am I supposed to live like this? A line in the local grocery shop's cashier takes ten minutes, sometimes more. Should I pass out standing at the IKEA's mile long queue? Yes, I know, I can order everything transported to my house by Amazon, Tesco etc. Just I don't want to live like this.