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I'm so sorry to hear that you're going through all of this!

It's definitely tough having to work so many jobs to get by. Are you able to budget some time in for self care, even though you're so busy? It doesn't have to be anything massive and it doesn't have to take up a lot of time. It can even be something as simple as putting on a face mask or painting your nails, but it's something you can use to treat yourself and help you reduce some of the stress you're feeling.

Perhaps you can also find an outlet for what you're feeling, such as journaling or just talking to someone about what's going on. For example, you can talk to your fiancé. It makes things worse to keep it all bottled inside so maybe talking about it will help a little.

As far as losing weight, instead of not eating are you able to talk to a nutritionist if you really do want to lose weight? They can help you get on a healthy diet plan so you still get the nutrients you need. It's not right that people have told you to lose weight though, and if the tables were turned I bet they wouldn't like it. Are you able to talk to them and let them know exactly how they are impacting you? Let them know that you understand they may be concerned, but it's rude and hurtful of them to point out your weight like that. Ask them to stop, and set boundaries with them if they don't, such as limiting contact if possible.