WITW is my problem?

I did not exercise today.  In fact, I haven't done much if not any exercise since this weekend.  The truth is, I am not confident that I will lose weight as I feel like giving up.  I have gained four pounds since last week and I would like to lose four pounds within the next 2-4 weeks.  I am on Weight Watchers, where learning how to eat is just as important as what to eat.  I feel like giving up and just stop exercising.  I haven't exercised regularly in months and I feel like not knowing what I need to do.  I hate myself for feeling this way but I really don't know what the problem is.