I have had these sort of pains for years, usually when very stresse, but sometimes oddly when the stressful situation has gone or been reduced; it's like I have been holding myself so tight due to the situation that when I release all that tension. Well something has to give & I get similar pains to what you describe.
My impression is that you're a single mum with prehaps not alot of immediate support & frankly I have no idea how single mums cope, the stress & responsibility of being a parent is enormous & naturally increases our worry about our own health.
One other thing though>>>> is there anything knew (plant, powder, perfume, soap, anything) at home or elsewhere thatyou might be allergic to, because allergies can cause many & varied symptoms, they're also a real pain because as they can be airborn they can be hard to locate much less do anything about.