Hair problems please help 😭

My hair has been extra thin lately When I tie it back you can literally see my scalp in some places I've tried everything From loose hairstyles to not so harsh chemicals in hair care I've also tried olive oil and coconut oil and hair masks I'm also on stress gummies

Also hypothetically if it was due to stress, when I'm finally calm (which I am as I have not had stress problems for 2 months) how long would it take my hair to thicken up again