I do understand exactly what you are saying. I believe in order to get "better" we do need to feel these emotions to some degree. I was in the darkest black hole that I have ever been in last winter, and several friends and family members thought that I needed some type of medication. I would not give in, and I choose to dig my way back out. Granted it is not "easy" but a lot of things are not.
You are so right about the things that we do have to be thankful for, which is what kept me going.
I believe that a lot of Dr's make it way to easy to get the medications that you are describing. I am not saying that there are not people that truely need them, but I do know if I had went in, that is what she would have offered me. I too lost both of my parents and the only sibling that I have has been on the "run" since a day before Mom's celebration of life. I finally realized this is what he choose and I am trying to move on.
Prayers and Hugs