welcome to health care magic
You probably have "major depressive disorder". All the symptoms mentioned by you like feeling depressed, feeling rotten stomach, disturbed sleep, suicidal thoughts etc are indicative of depressive episode. Sweating when feeling cold
could be due to associated anxiety
contains escitalopram which is an SSRI which is quite effective as antidepressant. But for its full efficacy, you have to take it regularly (no gaps) and that too for adequate duration (6-9 months at least). However, discuss all the stuff with your treating psychiatrist
and have full faith in him.
You may also require psychotherapy
sessions and relaxation exercises.
Wish you good health
Dr. Gourav Monga