Try not to over think it OP. (hard I know when you feel in pain)
I was obsessed with sun beds during my teen years (totally regret it now, but times were different then)
I done something very similar when I was about 15 I went to a tanning salon and had a 12 minute session, I met friends later on that night and went on again for 6 another minutes (obsessive I know)
That night I was in a lot of pain, I thought I would die lol
I had to fess us to my parents I had been on the sunbeds, they were furious as you can imagine
I missed school the next day, was bright red, blistered and my eyes were really swollen and puffy.
It was a big mistake but no long term damage (I know of) skin wasn’t damaged and is still relatively good for my age.
Plenty of rest, keep hydrated and take painkillers and apply some after sun lotion.
If you are still worried or anxious wouldn’t harm
going to the docs for a 2nd opinion, and there nothing to be embarrassed about x
Feel better soon OP 🤞