15 days late, not pregnant?!

Ive been getting every pregnancy symptom going but home tests are negative and so does the blood test from the doctors. I've been tested for a number of things, blood count, iron, thyroid, glucose, liver and all that stuff and apparently I'm fine? But I've recently been to the dentist and he says teeth are great and all but I'm ill and run down and need to go to the doctors. Still have no idea why I'm feeling like this or what's happaning. I have aspergers so going out causes me a lot of stress (and people in general) so that's the only thing I can think of. But all these symptoms are all too real. 😭😭