I agree with her above it sounds like symptoms of POTS I also have it and it can really take a toll on the body. I would also keep track of your symptoms and talk to your primary and a cardiologist. It took them several years to finally diagnose me. Best of luck and I hope your symptoms decrease for you.

I've had similar occurrences. Best I can tell, and forgive my plain language, is that it's the nervous system freaking out. Those symptoms sound like a POTS flare as well, which has been linked to endometriosis. Keep track of your symptoms and anything that may have triggered them, as well as anything that makes them better. That way you can talk to a doctor, and if you don't have a good one keep trying to find one if you can. Hope you feel better soon!

Thankyou so much, feel very low tonight, appreciate your reply x