How stupid is using while on anti-depressants

I’m a pretty experienced user having used a decent amount over the last 4 years.

I haven’t used in over a year. And in the last 6 months have started taking 375mg Venlafaxine and 30mg mitrazipine. I’m going to a festival in 3 months and was thinking of going cold turkey 2 weeks before to smash some at a festival.

Will doing this cook my brain? And if it will is doing 2-cb better?