I'll split this into 3 parts for each reply you made.
SSRIs can ruin people's lives = True and False. Most the stories you are basing that off is people who have bad withdrawals after many years of doing well on the drug, as said round here, if it ain't broke don't fix it. So most the time it's not wanting to be on medication for life, got to weigh that up for yourself, but if it gets you to the place where these are no longer problems but you got to take a small pill in the morning, who cares? I get the science behind withdrawals, had a few in my time too, but most the time it's 'if you were doing so well before, why did you need medication?' that and Benzo's, stay away at all costs. I say that but i take them sometimes, i wouldn't use it as a long term solution however. Anyway back the point..
SSRI isn't my favourite, i'd say it gets a bad press from a lot of DP people from what i've experienced and read most often and for me, wasn't hitting the spot, I like Mirtazapine which is Tri AD and a lot of people are on SNRIs which is more a go to here where i live for anxiety. In saying that Escotalipram (Lexapro) is an SSRI and a go to, with many people here on it.. also Zoloft which has a lot of bad rep (this is all from what I see, so take this all with pinch of salt) has a lot of people like me who don't enjoy it, but then i've read recovery stories with it. The key is to wait say 3/4 months and if it isn't helping, it's not helping, same with anything. Time to switch it up.
I can't really tell if it works well, you hate the thought, quit and it gets worse, or if the distraction is enough to lower your anxiety and it doesn't become a problem, you can figure that out, and either keep taking it if it's working or if getting out of the anxiety loop as mentioned in Holy Grail DP is working, do them steps and get your head out of the game of worry, stress and anxiety. I personally lowered my anxiety huge, it's the first step to any of this IMO. I no longer have anxious thoughts even if i feel anxiety.
Music and DP is so common, you've heard a song about DP you just didn't know, examples:
Iris - Goo Goo Dolls
Basket Case - Green Day
Numb - Linkin Park
Creative people tend to think outside the box, so cause anxiety with thoughts bigger than the more common view of 'get up, eat toast, go to school/work, come home play with the dog, eat dinner, go to bed, repeat'. Some people and i know it sounds strange, literally have no other wants or deeper thoughts about life.
Philosophies is the road to anxiety and existential thinking, known to cause great unrest for use of a better word, i could link you to a page, but it's basically all the types of things you are stressing yourself out with, I know you think videos on the subject help you get it out, but what would really help is to actually distract yourself any time this comes into your head, it takes a lot of practice, i have various ways when i use to have thoughts of a similar deal, i mainly got up and walked to the shop, i made sure for a year that i had to buy dinner every night, sounds weird, but it meant, them thoughts hit, i instantly had a walk, some distraction. Another one for me at the time was call of duty (xbox) it took so much concentration i had no time to think about anxiety. Sounds weird as it is a jumpy shooter game i guess, but made me relaxed.
It doesn't pass in a day, it takes practice, i know you feel better today which is good, but for you it sounds like a mixture of obsessive thinking, thinking about things you can't control, health anxiety, stress and all them things... which i think you have realised, so good luck on your journey