i've got the same situation as u do..
my last M was Apr 6.... but M still hasn't arrived even now... M came regularly every month before april... about 30 days cycle....
i felt 氣喘 & 手脚無力 suddenly in the last few days.. would feel better after resting for an hour.. also.. i feel dizzy sometimes....
have u got the result yet? i still haven't known mine...