Thank you for your Question.
For your Query I contacted the office of Sayyid Sistani and they said :
1- For your past salah, since you were doing your best at that time then your salah are Ok InshaAllah
2- For doing your Masah on the socks, since you didn’t know, it’s perfectly OK and accepted InshaAllah
3-Waswasa can grow serious if you don’t treat it
Pls refer to the following link for its treatment: