Holly,

I don't think there's any harm in taking the treatment as a caution. Just be aware that it means that DS will be getting the treatment too, as well as you. It's a decision you need to make and if you think that the benefits (possibility of relieving bad pain!) outweigh the concerns about using the treatment, then go for it.

It sounds like your DS may have a sucking blister - they normally occur on the top lip (the skin just above the top lip) and I haven't heard of them on the tongue before, but especially if it doesn't hurt him at all, it could be one of these. It usually means that your DS (which you know already!) is a good sucker, and doing plenty of it!

My nipples sometimes go white also when DD has been sucking really vigorously, and even though I'd had our attachment checked numerous times and all is really good, sometimes when she does suck vigorously it really does hurt and makes my nipple white. When I think about it, it has been these times that I have also experienced the vasospasm-type stinging in my breasts also. She's been a really aggressive sucker too - and perhaps as you say it could be a combination of your son's suck (causing vasospasm) as well as having thrush that could be giving you these symptoms overall.

I hope all the info has been helpful, and I really hope the pain your experiencing lessens really soon.