If taking an anti-estrogen/test booster ( nolvadren xt) would i suffer any rebound effects of raised e when stopping supplementation?

Yes: Any time you take something that affects your natural production of hormones, there is typically a "withdrawal" that occurs as your body tries to return to its natural state. This is especially true with any "supplement" that affects testosterone production. That is why most of these supplements are banned or become banned once the governing bodies learn about them.