That's great you have your appointment tonight OP, I hope it goes well.
I think this is a great opportunity for you to take control of your anxiety so it doesn't rule your life.
And to reduce the factors that are in your control - for example I don't know (obviously) the reasons you are obese but I do know that it causes you additional health anxiety. Maybe you can try to channel that anxiety into a plan of action to get your BMI down through some fun exercise, new recipes etc.
You might not be able to start anything right away e.g. group classes, but you could try some free online workouts to see if any are fun for you and then look for similar classes in your area for when you're able to socialise again.
I remember a friend of mine with health anxiety (caused by the trauma of a serious case of sepsis) saying it made her world feel so small that it was full to the brim with thoughts of her health, worst case scenarios etc.
Rather than trying to push her thoughts about health out of her world, she made her world bigger so there was room for other thoughts if that makes sense?
She added new layers to her life - a hobby, some classes, seeing friends more often etc and found that as her world was bigger, the health anxiety took a much smaller proportion of her headspace. You could do all of that, bit by bit, once things are back to normal when it comes to social restrictions.
I don't know if that helps at all but something worth considering maybe?
Getting healthier can only be a positive thing and sometimes a health scare that triggers trauma and worry can also be a trigger for a positive change in your health.