Sometimes, when I’m really tired I can’t tell the difference between hot and cold when I’m running a bath. I’ve burnt myself a few times because I thought the water was still cold. This is because the more extreme the temperature, the more white the colour of the sensation becomes on my hands, regardless of temperature. When I’m really exhausted or run down, even normal temperatures of hot and cold can confuse me.
Experiences like this have made me realise that I actually rely more on the synaesthetic colour/pattern information my brain receives, than on my other senses. I look for the colour/pattern first, and when that isn’t clear, I fall back on just using my ears, hands, eyes etc. But it’s hard to switch because sometimes I forget how that works.
The thought of waking up one day and finding that I no longer have synaesthesia scares me. I rely on it for so much in my daily life, it would so hard trying to adjust to life without it.