Why is my leg so wobbly? It is worse when pt puts ankle weight and makes me stick it out,

More info needed. To receive an answer that will be more helpful, you need to give more information...Your health status, any problems such as gout, diabetes or blood pressure concerns. You should state how long it has been a problem and what you do to make it feel better. Also tells us what it looks like. Is it discolored, swollen or point tender. The more you tell the better the answer.
Muscle weakness. The commonest cause for what you describe is muscle weakness. I presume you have been checked up before you started pt.