This is sad to read. You came so close, SO close to ditching social media, only to turn back to your old fix when life got tough. I'm sorry, but if your mental state is so fragile that you need social media to prop you up, you need to be in intensive pschotherapy. You went back to your old crutch thinking "the pros outweigh the cons" spoken like a true junkie, just a digital junkie.
This, right here, proves my point. You recieved an outpouring of support from people you havent seen in yonks. That isnt the kind of support you need. Saying "get better soon" on a facebook post requires 0 effort or feeling; just a cheap thrill of dopamean. The support of family members and close friends, talking to them in person, is far more rewarding and helpful then droning facebook accounts. I went though this, complete with a 4 day coma, at the age of 7. It sucks. but you will survive it, as millions of us do every day, and in that moment you needed to seek professional help. Instead you turned back to your drug of choice, falling into the same trap and excuses you already had. Type 1 diabetes sucks, especially developing it at such an old age (the vast majority of cases occur under the age of 18, I cant imagine adjusting for it in my mid 30s) but going back to social media looking for support isnt the answer. The groups on social media for support have the same issues, things like echo chambers and narcasistic tugging, that the rest of social media has, and there are some dangerous ideas that propegate through those "support" groups.
You fell off the horse, time to get back on and try again. Ditch social media, it isnt worth it. You say you didnt feel happier, but it takes years to undo the damage of addiction, not mere weeks. I ditched social media 3 years ago and only started to really feel the effects two years later. It's an invisible change, onle you dont realise until you take a LONG break, only to look back at social media now with a longing, or a curiosity, but a disgust for the cesspit it truly is, looking from the outside in.