I have seen my doctor and at the begining levothyrox made me feel better but now no results my thyroid is goind to be more underactive (lab results) also I have gastritis so is that vomiting related to hypothyroid or gastriris?

Gastritis. Your vomiting is related to gastritis why do you think you result is going to be under active? Keep taking your thyroid medicine at least 2-3 months before you check it again by a blood test. Bilsalamah.