New here and to VLCD's

Hi all,

I've been on HMR 500 VLCD for about 3 weeks now, and man am I
struggling with it. IS it normal to be incredibly, INCREDIBLY cranky
and irritable on this? I'm just always in a nasty mood since starting
it. I started out the first week doing great, I had nothing but the
shakes, then my birthday came around and I went out for dinner and the
next night had to attend dinner with family and have birthday cake. I
resumed without problem and remain deterimined until I had a really
lousy day, so I ate lunch, then went out to dinner, and ate again this
weekend. My poor husband has had it with me, and while I am losing, i'm
frustrated and feeling angry and keep sneaking food here and there.
HELP!