Will there be health benefits of fasting while overweight? Also would love some support.

I just read someone's post that said it isn't fasting if you aren't close to your ideal weight. I started getting sick, I believe allergy related or Histamine Intolerance about 4 years ago and have rarely been able to breathe through my nose (stuffed sinuses) my skin is extremely itchy and can be drawn on, I'm lethargic and have cloudy thinking (short term memory is awful right now) & I am just so tired of not feeling well. So I decided to do a 30(or close) day Water Fast after reading about all the benefits. Of course the weight loss is nice but there are other ways to lose weight. I want to feel good again. I want the incessant itching to go away. It drives me crazy! I'm on day 12(+a two day false start where I ate something in the evening) water fast. I also was brushing my teeth with toothpaste because I didn't know any better. Will the fast not give me health benefits because I'm overweight? It made me sad to read. I never should have let myself go like this, but emotionally it was my protection for some years. Not consciously.

Maybe I'm also feeling emotional because this fast is really difficult. I have had to keep it a secret from my older kids who live with me because it scares them and one of them has an eating disorder. I'm a single mom. I finally told one and showed him some articles on the benefits of fasting so he's being supportive. I've gone through his birthday with the most delicious food I've ever smelled and cake and everything without eating so much as a taste. Just water water water... and the mucus that drops down my throat from my stuffed up sinuses. Sorry that was gross. (will this ruin my fast by the way?).

Lol I really feel like a sensitive delicate flower from this post. Any help or support or answers are appreciated.