Thank you for the query.
Blisters on your gums may be because of friction with rubber regulator you used,for the relief you can use mucopain/dologel etc......... and instead of using rubber regulator you can use silicon regulator.
The other symptoms you discussed shows it is a condition known as aerodontalgia.
Aerodontalgia is a condition in which pain in the teeth results from change in air pressure as in flying,mountain climbing,scuba diving.
This pain arises because of entrance of gas in the gas spaces in the roots of infected tooth,along dying nerves,necrotic pulpal tissues,edges of fillings in already filled teeth,through micro fractures
of enamel and dentine etc.........
Treatment of such cases includes analgesia and dental repair,biannual dental check ups,x-rays examination, if indicated.
Hope this relieves your symptoms.