White tongue related issue. Tests doct!

I am having white tongue and throught pain i couldnt eat food properly even when i am hungry . I tried to scrape the white layer it bleeds and my gums bleed . The white layer is all over my tongue it smells bad . I feel fatigue and couldnt do anything all my body hurts and i feel black my vision suddenly blurrs and goes black like i am about to faint . My joints hurt . All i can do is sleep . I have been eating only one meal a day since an year as i caoukdnt eat due to the throught issue . Please doctor suggest me what tests should i take 1. I have had unprotected sex in sept 2024 and i have this problem from oct 2024 2. Due to some work i used to skip meals since an year 3. I am in a lot of stress and my hair falls out too much excessively 4 . I have nad breath , creamy tongue which doesnt go off since oct 2024 5. I couldnt maintain a proper diet since an year and i am underweight 6 . I havent gone out since months as i am feeling weak 7. Pls suggest me with all the tests doct