Others ?

So has anyone else gone from name brand to generic of vyvanse ? I was recently switched and feel tired and like my minds all over the place . I’m gained a lot of weight as well and just can’t seem to stay focused . My anxiety is awful . I’ve been on vyvanse for 8 years and only a month and half on the generic and I can’t stand it . Should I talk to my dr about this or is something wrong with me ?