thank you so much for your reply.

i am really so nervous your suggestions really helped me to calm down. 
if they will reinstate me instantly then there is no problem. but i have one problem. i had skipped a semester but had informed international adviser because of my health issues. i had submitted the doctor note as adviser had advised me to do that. but it was 2 years ago. otherwise everything was good. i am full time student havent worked in social security and maintaining GPA too. now i am feeling little scared about that thing. i hope it will not affect me now.

shall i take immigration lawyer or i can do all those paper by myself?
please kindly suggest me.

thank you