Thanks for the replies all. I'm going to try and stay off vaping altogether for a few days. Even before the bitter taste and just vaping VG and no flavours, the back of my tongue and top palate constantly feels rather dry and almost a bit numb which stops me tasting flavour properly on the exhale. I've got a couple of tins of flavoured snuff that a vaper from another forum gave me over a year ago. It's not much fun but at least it gives me my nic fix and should let my tongue get back to some sort of normality.
I'm not sure about acid reflux. It's definitely crossed my mind before. I don't get heartburn or any symptoms like that. The thing is, when I vape pure VG and nicotine, I don't get this bitter taste, just the regular throat clearing. It's only going back to flavours that I get the bitter taste, so it seems to be do with the vaping. I'm also wondering if the spitting from my new wide bored drip tip RDA, which has been spitting drops of juice onto my throat, is part of the issue.
I'm not sure about acid reflux. It's definitely crossed my mind before. I don't get heartburn or any symptoms like that. The thing is, when I vape pure VG and nicotine, I don't get this bitter taste, just the regular throat clearing. It's only going back to flavours that I get the bitter taste, so it seems to be do with the vaping. I'm also wondering if the spitting from my new wide bored drip tip RDA, which has been spitting drops of juice onto my throat, is part of the issue.