Recent feeling of having no appetite unless I smoke weed?

Lately I've been smoking a lot heavier than I used to. I don't care for any comments telling me not to smoke weed because I do what I want. Weed is the only substance I use, no alcohol or any other drugs or cigs. Lately, for the past couple of days I've noticed that when I don't smoke I feel kind of sluggish and I get hungry but I also get nauseous at the same time, resulting in me barely eating. Unless of course, I'm high. The only time I can eat a decent amount of food is if I'm high. This feeling has only recently came about. I've only felt this way for these past couple of days. I've also been eating less to lose weight. I plan on smoking only weekly now. What else can I do to help? What is going on?