You misread the menu (although I can see how you made the mistake and from the many posts here, you're apparently not alone in doing that).
You asked for a baked potato instead of fries, which wasn't actually on the menu, so the kitchen had already been kind in accommodating you.
I think the issue is that you resent paying for any meal, and even if it was cooked wonderfully with excellent service, you would still be upset because you're not ready to cope with eating food outside of the home yet.
Your DH could have been kinder in how he framed his comments about not eating out with you again, but I understand why he was emotional when he felt like you ruined yet another social eating experience for him, and he's not wrong to suggest that you put a pause on eating out until you develop some better strategies.
I think you should focus on enjoying nice food together at home, and when you feel more comfortable eating as a family at home, you can explore eating out again at certain restaurants, gradually broadening where you will go. It might also be worth going back to therapy if you aren't currently receiving any (I say back, because I would hope that with an ED someone had previously helped you access some).
Your behaviour was upsetting to your DH, but I think it's really the ED he's upset with, not you. In the moment, it's difficult to articulate this, so when you've both calmed down, it's worth a gentle chat to discuss how you can tackle this together.
Some restaurants do 'eat at home' kits where you can cook already prepared fancy food. It's not much cheaper than eating out, but it's a treat, something different and you would have more control over it? Could something like that be something you're willing to try to work towards?