When you are in that valley it can seem like the path is endless. I also see some determination in your post - putting one foot in front of the other. The other thing is that you came here to talk to others about how you are feeling - the people here are very supportive. Jess' reply has some useful information in it.
Can I ask if you had spoken to anyone before about what are going through now? If so, can you remember what exercises (mental) to do to help?
There are threads on the forums here for grounding and mindfulness that might give you some ideas as well. I hope you might come back and share more of your story.
Listening to you.