Any tips to help with sadness?

I've been struggling recently, especially with my exams in two months and my weight gain. I have never bothered too much about my appearance (not even my teeth, which are terribly crooked and require braces), but now I feel like I have some responsibility. I'm not the typical teen, but this has been quite frustrating.

For the past two weeks, I've been waking up late, sleeping late, overthinking and overanalysing, and feeling fatigued and upset for no reason. While I smile and laugh at jokes and stuff, even my family's starting to notice that I'm more withdrawn.

I just binge watch random stuff, and eat biscuits these days instead of preparing for my exams. My only relief is when I pray and then journal for a while; I feel calmer and more in control after that.

So to anyone who has any experience with this, could you give me some tips? I could really use some sound advice.

Thanks so much for being here!

-Angel

Edited