I'm not qualified to give medical advice, but my understanding is that depression & stress can cause other symptoms, and it's also true that other medical conditions can cause depression & stress. Or it could be completely unrelated. So if you can, I'd recommend a checkup by a doctor if you haven't had one in a while. You'll hopefully get a better understanding of what's going on to relieve some of your worry, and appointments usually come with a mental health evaluation anyway. Also when you're alone, it can be nice to talk to someone whose job it is to care for your health and wellbeing.

In the meantime please take care of yourself. I'm 34F and can relate to your situation a lot.