I want to welcome you to the forums, and to echo Sophie_M's comment that you have found a totally safe and non-judgmental space to share these thoughts and feelings.
I am so sorry to hear that you have been struggling with all this during an already stressful time for the world, and a time when it seems like other things in you're life just aren't in order and clicking like you would like them to. When we feel the way you describe, it can become difficult to get the motivation to fix those things, so they pile up, which makes us feel worse, etc. I think one practical thing you could do is ask your partner to help out with some of those more mundane things like the stove and explain that it would do a lot to help your world feel more organized and in control.
Reading what you've written about how much you're struggling, especially your physical symptoms, it sounds to me like you might be dealing with some depressive feelings. I am not a mental health or medical professional so please do not take this as a diagnosis, but I do know a fair bit about this stuff from my own experience and can tell you that at the very least it sounds like you're struggling enough to merit a talk with a GP. Would you be open to that, if only to get a referral to a counsellor or another professional you might talk with?
In the meantime I am always happy to keep chatting, as are the other lovely people on this forum.