Well, I would classify what's going on with you to be urgent if not an emergency. But are you sure your doctor's office is still closed? Most doctors' offices are open now here in Seattle. I just got back from my doctor's office where had my cholesterol and thyroid screened and also got treated for an upper respiratory infection I've had ever since the pandemic began.
The office actually called me and told me I was due for my cholesterol screen and wanted to schedule it as quickly as possible, which we did.
Even if your doctor's office is not open, most doctors know they have an obligation to keep up with their patients, especially if those patients just had surgery.
At very least, I would leave a message at my surgeon's office, because there's no way that they are completely cut off from civilization. They must have a way to retrieve messages from patients because there must be patients with serious problems who need attention.
Also, in re-reading your post, it sounds like you're saying you lost 70 lb in 2 and 1/2 months and gained back 35 in the same time period. I can totally believe that you lost 70 lbs during that time because that's about the same as what happened to me. But I don't know how you could have gained 35 pounds back already.
I don't see how this kind of weight gain is possible at the same time as you're losing weight, unless you aren't following an eating plan, or unless you have some post-surgical problem like strictures, which usually happen early in your post-operative stage.
In any event, you are correct, you do need help. And you really need it right now. So I would make the call and I would also contact the nutritionist that you must have been seeing prior to surgery and then if you are following the eating plan, I would be very concerned. Once you have ruled out the organic problem, then you can move on to the emotional problem and focus on that. But you have to find out if your stall is related to a malfunction in your digestive system.