Using lip balm while fasting

As-salam Alaykum My question pertains to using lip balm while fasting (this is more complicated than you might think). I have developed a condition on my lips in which it has become compulsory to use lip balm after every 15-20 mins. This came about as a permanent side effect of an acne medicine which I took many years ago. The problem is that the lip balm is always going down my throat as I can taste it. This is when I am not fasting. However, when I am fasting, I still have to use the lip balm because of the (extreme) condition that has developed. I can do without food and drink but I cannot do without lip balm any more. Should I continue to fast or should I stop fasting and just pay fidyah for the rest of my life? Thankyou.