Dont feel like your going mad! I am going through exactly the same thing at the moment. My period isnt due for another 3 days. But I have quite a few "symptoms", I cant even move without wanting to be sick! I have a gut feeling that i am, like you I just know! If you dont want to wait for a Home test, why dont you go to the doctor for a blood test?? They can detect really low levels of HCG, so you can find out much sooner. Fingures crossed for me, I had one taken last night, I get my results on sunday!
Good luck to you, I really hope it works out for you!