Hi @niijii8
What a terrible ordeal. I thankfully have not lived in a moldy house, never in my life (at least that I know of). I did however, as I suddenly remember, one day go on holiday and stayed in a hotel that I thought was pleasantly yet strongly perfumed with lots of inscence. When I started walking upstairs the smell changed, and after the first floor I realized this was mold. The entire hotel was stinking of mold, it was so strong that i could sometimes hardly breathe. I remember my ex's foot was infected with a fungus after this, up to his calves. I didn't have anything but now I wonder.
I also stopped eating added sugars about three years ago, which completely cleared my stomach pains, and the pains I had due to fibromyalgia. Which was great! It was entirely coincidental by the way, my goal was to lose weight. I forgot to take my stomach meds and then realized I no longer had pain.
Where is the top of the abdomen, where did you feel your heart beat? It sounds like the pain I am having now, strong heart beat, it is at the same height as my heart, but on the back of course. It is rather a strong pain, pulsating, and gets worse when I sit and my back is against the (soft) couch.