That's good you are getting tests done. Yes it's possible you have some sort of condition, but if you have health anxiety there is a big chance you are jumping to conclusions and imagining you have the worst thing you can find on good ol' Google!
Of course get checked for anything serious, but it's more likely to be something mundane. Now that I'm getting older I sometimes get aches and pains from inflammation depending on what I've been eating, which can be exacerbated by stress and nervous tension.
I also think there can be a connection between things like depression and muscular pain, because our body has natural pain-killers like serotonin, and when we are depressed these are depleted, so we feel every ache much more strongly. Along with a good multi-vitamin, I often take a supplement called 5HTP, which is an over-the-counter antidepressant, for muscular pain, and you mentioned you are depressed. If you get treated for depression you may find the pain subsides.
There are other ways of increasing endorphins, such as with exercise, although I appreciate you might have to start gently with something like walking if you are in a lot of discomfort.
Anyway, just a few thoughts on the subject.