I’m mortified to post this but don’t know who else to ask 
I was having some ... alone ... time earlier today and had a bit of a funny episode . Had an orgasm but felt unusually lightheaded , suddenly very hot in my face and heart pounding (but not unusually fast) just prior . Sort of like the feeling if you strain to use the loo or stand up too fast .
I have major health anxiety and often panic about my heart - I get skipped beats and have been checked out dozens of times with ecgs , monitors , a treadmill , an echo etc as was some query over family history . Always told I’m fine and it’s just anxiety . Anxiety to the point I don’t go out anymore because of it .
I’m very concerned about what happened earlier although rational part is saying maybe low blood pressure , tired , due a period , on strong painkillers , dehydrated (think might be a UTI starting) and been sat in the sun all afternoon ... is there a chance it’s just that ? I really, really don’t want to be asking anyone for help if can avoid explaining .
I feel fine now fwiw ...
I’m mortified to ask but any reassurance that I’m not needing to panic would help a lot .