@milja - A huge well done from me, for making such great progress with your ED. I'm neither T1, nor an insulin user, but I did live with an eating disorder for a some years in my earlier adulthood, so I do understand how these things can capture bright, intelligent people who seem so in control of their lives.
Some find losing weight when low carbing. I'm assuming that as well as your psychological well-being that the physical side of things is being monitored too? I'm hoping things like your thyroid will have been monitored, just in case. If that's abit off kilter it can have quite an impact on our metabolisms.
The good news is most T1s have their thyroid health monitored routinely.