10 week old pitbull having balance problems after she eats? ?

my 10 week old pitbull seems to be pretty shaky all the time. now after she eats she seems dizzy and her legs buckle underneath her. she actually fell into her water bowl because her legs gave out. when she walks away she walks very slowly and isnt quite prancing the way she normally does. she seems dizzy and wobbly and first chance she gets she lays down and goes to sleep. she did this yesterday while we were walking and she eventually just layed fown on the concrete after repetitively falling on her face. idk what could be wrong with her and im scared. she eats half a cup of food in the morning and half at night and weve been weening her to another food. i think she also has roundworm and tapeworm but she has been dewormed twice and we are finding dead ones so im pretty sure those arent giving her too many problems now. i just really want her to be ok...