i had wls 18 days ago. i'm always so very tired. any suggestions?

What is wls?

Weight loss surgery? If that's the case, I'd expect you to feel very very tired. Your body is recovering, plus you can't take in much food. Patience, rest, and protein....and listen to your doctors! Surgery is not a 'quick fix', it basically forces you to live a new lifestyle, because you physically can't do the things you did before.