As you are 16, these all problems are likely due to puberty
changes taking place and hormonal
changes take place,at this age one becomes more sensitive and feels that you are ignored and having full of tension without any reason.You remain in continuous tension as if all problems and all diseases you get.
Another problem you got is throat infection
,for that you take one anti biotic course and you will become all right.
You take advice of Psychologist
and go for Counseling.it will be very useful to you.
Ok and take care.