Dream recall is very weak during REM sleep. SSRI drugs suppress REM sleep to good proportions, so one could infer that it's not your dreams that are overly intense, it's your recollection of them that is.
•Why do I dream so intensely/vividly and remember each one every single morning as if I live two separate realities?
The genesis of SSRI withdrawal is unknown. It's hypothesized that it's due to serotonergic dysregulation. The severity of SSRI withdrawal is in correlation with different SSRI pharmacokinetics, specifically the different half-lives. This is a strong indicator of a causal relationship.
•Why does Paxil cause such horrible withdrawals and why after quitting has my anxiety intensified tenfold for months until I am back to the drug? What exactly happens to my serotonin receptors(?) and why does it take so long to heal?
Tolerance, receptor desensitization, and a cap after reaching a certain plateau are all hypothesized to play a part in the rapid decline of a clinical benefit in SSRI drugs.
•Why has this drug done such wonders for me in the beginning of usage and made me the happiest most outgoing person, yet now, even if dosages are increased I remain depressed and unmotivated. It seems no amount of dosage increase could break the tolerance. Why this tolerance? --->
The brain damage issue is a myth, the heart issue of delayed QT intervals or arrhythmias only occurs in high dosages and in select case reports. The most predominant symptom of long term use is sexual dysfunction. SSRI drugs have displayed that they are possibly teratogenic substances. For the majority of people though, they tend to be relatively safe drugs.
•Are there any known permanent effects on brain chemistry from long term SSRI usage? What about physical health(; may I die when I'm 40)?