That really is more of a philosophy question than a medical one.
Amnesia is a condition that can happen to a person that had severe trauma to the head like in a car accident or so. It could also be because of external pressure or stress, or it could also be a problem of the brain and memory functions.
If a person has suffered from thyroid cancer, and has had their thyroid gland surgically removed in order to treat the cancer, that person would then have the most severe form of hypothyroidism, which is to have no thyroid gland at all.
Depression
psychiatrist.
retrograde amnesia
There are no specific things that you would forget. It depends on what kind of amnesia you get, and how it acts out on you. Some things you might forget are friends, family, events that happened, and sometimes when it gets severe, your own name. Retrograde amnesia makes you forget some, most, or all of the things that happened to you before what caused you to get amnesia. People you met, things that you did, etc. Anterograde amnesia is the kind of amnesia that causes you to not be able to create any more memories. Of course, there are many other types of amnesia. If you get retrograde amnesia, or any other amnesia that makes you forget things, there are no specific things that you would DEFINITELY forget.
Halifax
The Boy in the Bubble
He suffered severe trauma in the accident. The loss of her parents was a severe trauma for the young girl.
He suffered severe scarring from a childhood disease
Fortunately, many people who suffered from severe injuries after an accident were able to recover within a reasonable amount of time. However, there are also several cases wherein the injuries affect a person's life forever. In a case where a person has suffered a serious injury because of the negligence of another person, a legal assistance has to be sought to get a claim through settlement. You can get a more understanding of what settlement is all about through the provided link below.
Sting has stated that he has suffered from severe depression. The latest information that I could find makes no mention of manic episodes, just depression. He has said that while writing his memoirs, he suffered from depression for two years before coming out of it.