OP, . . . please do me a favor, . . . if not for yourself or your family, . . . go see your doctor.
I went for years not being able to find out answers to questions like your falling down.
Turned out I had a serious heart problem that has been since corrected. I stand a good chance of seeing the next 15 or 20 years now, . . . in Jan of '08, . . . I didn't.
Please, . . . don't take the chance, . . . take it from one who has been on that other side, . . . it ain't pretty.
May God bless,
If you can breathe, . . . thank God!
If you can read, . . . thank a teacher!
If you are reading this in English, . . . thank a Veteran!