I like the phrasing of your question; "without help from professionals or medication", but it leaves space for some kind of help. Thank you for answering this question! Before I say my piece, I'd like to say that each person has their own unique experience, situation, and needs. What works for one, may not work for another...
With that said, I'd like to share my experience:
In my case, I had very good friends who really stuck by me and helped me depending on what I needed at the moment. For example, I asked one friend if I could call her, just to feel someone else's presence. And we did! Another friend checked up on me often. I also had another friend who was basically like a listener, similar here in 7Cups.
My faith matters to me, so clinging on to that helped me greatly as well. I gave myself space to take a lot of breaks too, rather than taking on so much more than I could chew.
In essence, what helped me was: social support, faith, rest.
For you, I think that it would help thinking about what helps you, and what you need. I was in a really stressful position then, so a break helped. I know some people who needed the opposite - they needed something to do or think about, like dance, art, a game, and so on. So I think one good step, aside from asking this question, is to reflect on yourself and your situation too :)