I was also thinking about a night guard as well.
I wear one at night to protect my implants, that I had fitted last year. It felt a bit awkward at first, but now I hardly notice it.
just to confirm after buying and using titanium - I tried them for about 6 months or longer - then bought the valplast which would be fine if my gums were in order.
It is my opinion that running your tongue over your gums will not cause blisters, cuts etc. I take the view that you could be allergic to both titanium and valplast. Consequently, as your Dentist is expensive and of little help to you, perhaps you should have a few words with your GP.