My H3 did same thing a few days ago, was listening with bluetooth headphones & suddenly lost audio, went to menu & had no bluetooth settings either. Luckily after rebooting the bluetooth settings on mine came back & I could re-connect the headphones again. First time issue (in 2.5 years) so must be a software glitch, hopefully you get yours back.
I've checked my information and I see the bluetooth icon disappearing from settings is a known issue, and that a hard reset is the current workaround. I would be happy to leave feedback on your behalf, DKW9130! Send me a Private Message with your phone number and 4-digit PIN so I can submit this feedback.
You can view step-by-step instructions on how to send a PM here: https://communities.dish.com/t5/Communities-101/How-To-Send-a-Private-Message/td-p/15039