Whats wrong with me

I haven't had an appetite at all lately. I'd sometimes eat once a day or not at all. Before I'd used ti eat 3 times a day and little healthy snacks in between. Now I hardly eat. I can eat one time a day and that's it. This has been going on for about 3 weeks or longer at 1st it was because of stress because I lost my job, now idk what's going on I just have no appetite